Xu Yueren looked up at the direction of the broadcast with a sullen face: "You've been waiting for me to act, right!" ”

"Yes," said the mysterious man, "but I'm also looking forward to you discovering the subtle traps." ”

Xu Yueren stopped talking, and Fang Yao frowned: "Mysterious person, since Yueren has discovered the so-called trap, then you can revoke the trap." I think your expectations have been answered, so don't bother us anymore. ”

The mysterious man said: "Miss Fang Yao's analysis just now is very accurate, okay, plus Mr. Xu Yueren did see the clues, then I will tell you." The place to solve the problem is in the curtain world under the stage of the robot ring, there are two things in it, take it out and put it on the chemistry test table, and you can do it. ”

The words disappeared, Xu Yueren took a deep breath, and said to Zhu Shao: "Do me a favor, and look for any beakers according to what the mysterious man said." ”

Beaker?

Fang Yao pondered and was extremely frightened: "That's right! Only one beaker! Ah, I see, the sinkhole in this level is that the mysterious man only prepared a beaker for us on the surface! Red first and then black is a ...... Dispenser! Is the dropper capacity not enough and requires a beaker to carry it multiple times? ”

Xu Yueren nodded: "Yes, one dropper is 20 ml, and the other is 30 ml, think of them as 'two' and 'three', as you know, there is only one beaker, and no matter what I do, I will fail." ”

Fang Yao was secretly glad: Fortunately, with Yueren's observation and stability, he didn't follow the way of the mysterious person.

Zhu Shao searched for a long time under the ring, and finally walked over with two beakers.

These two beakers, with the same capacity, are labeled "No. 1" and "No. 2" respectively on the surface.

The mysterious man said: "Then it should be my business, slip away, Mr. Xu Yueren, prepare the solution in one go, complete the problem, and unswitch the card~"

......

Xu Yueren took the beaker and said to Zhang Huixin: "There is Lao you to help me keep an eye on it, I have an omission, and I will correct it immediately." ”

Zhang Huixin's sense of responsibility increased sharply, and he was engrossed.

"Red Six, Black Five, First Step!"

Just when Zhang Huixin was about to run to the memo board to read the small characters, Fang Yao had already recited aloud with full tacit understanding.

Xu Yueren quickly took a 30-milliliter dropper, filled it with red liquid, put it into the No. 1 beaker that Zhu Shao took from, and then took it again, as before.

At this point, the newly taken beaker No. 1 has 60 ml of red liquid.

He then continued to use the dropper, sucking up 30 milliliters of black liquid and placing it in Beaker No. 2.

Next, he used a 20-milliliter dropper to suck up the black liquid, which was also dropped into the beaker.

Therefore, the No. 1 beaker that Zhu Shao took out is currently holding 60 ml of red liquid. Beaker No. 2 currently has 50 ml of black liquid.

Xu Yueren asked Zhang Huixin beside him for caution: "Is it 'red first and then black?'" ’”

Zhang Huixin said: "That's right, so in order, you should pour the black liquid into the red liquid." ”

He said: "That's what I mean, the red liquid is the base, and every time you pour in the black liquid, this can also be dissolved." ”

He mixed the black liquid with the red liquid and got a brand new red and black solution!

Finally, he poured 110 milliliters of the red-black solution into an unused beaker that had been placed on the bench.

Step 1, you're done!

"Fang Yao, strike while the iron is hot!"

With Xu Yueren's energetic words, Fang Yao also raised his voice: "Red eight and black four will continue quickly!" ”

In order to verify it, he said to Zhang Huixin: "The 30 ml liquid dropper, use it twice, and the 20 ml liquid dropper, use it once, it should be Red Eight, that's right." ”

Zhang Hui pondered for a moment and said, "Yes, the number of times the dispenser can be used has not exceeded the limit. ”

So, he took it twice with a 30-milliliter dropper and then a 20-milliliter dropper, and the red liquid was uniformly dropped into the No. 1 beaker.

"Black Four is very simple, just use a 20 ml dropper to take it twice."

Zhang Huixin nodded.

He took the black liquid twice with a 20 ml dropper and placed it in the second beaker.

Then, he skillfully mixed the black liquid in the No. 2 beaker into the No. 1 beaker to obtain 120 ml of the mixed solution.

Pour the mixed solution into the benchtop beaker again to obtain a total of 230 ml of mixed solution.

"Red seven black seven halves."

Without Xu Yueren's reminder, as soon as Fang Yao saw that he had completed the current solution preparation, he immediately continued to say the puzzle out loud.

Xu Yueren said to Zhang Huixin: "This is simple, use the 30 ml dropper once, and then use the 20 ml dropper twice in a row, whether it is red or black liquid, do it." ”

Zhang Huixin blinked: "Well, this seems to be the easiest." ”

As a result, Xu Yueren quickly completed the preparation of 140 ml of mixed solution.

At this point, a total of 370 ml of the mixed solution has been prepared.

Fang Yao said: "The last step, the red four black one completes it." ”

Hearing this, Xu Yueren frowned slightly: "Red Four is very simple, you can use a 20-milliliter dropper twice." The problem is black one, black one means 10 ml, but our minimum value is 20 ml per dispense......"

Zhang Huixin said: "Indeed, I haven't encountered this situation before. ”

Xu Yueren said: "No matter how much it is, in short, there will be nothing wrong with the red four, let's match the red liquid first." ”

So, he quickly took 40 milliliters of red liquid and put it in Beaker No. 1.

Zhang Huixin touched her chin and said, "Hmm...... It's 30 minus 20 equals 10, but the problem is that the minimum value of the liquid is 20......"

Xu Yueren immediately patted his head: "I'm so stupid, how could I forget such an important thing!" ”

Then, he pointed to the two test tubes that had been "lying on the corpse for a long time": "The test tube that matches the dropper capacity is here, how can you ignore it?" ”

Zhang Huixin also suddenly realized: "Hehe, it turns out that it's that simple. ”

Xu Yueren used a 30 ml dropper to suck up 30 ml of black liquid, then dropped it into a 20 ml graduated test tube, and finally dropped the remaining liquid in the dropper into the No. 2 beaker.

Since then, Beaker 2 has 10 ml of black liquid!

He breathed a long sigh of relief: "50 ml of mixed solution, done!" ”

After skillful operation, the mixed solution from Beaker No. 1 was poured into the beaker that had previously held 370 ml of mixed solution.

A total of 420 ml of mixed solution, all done!

Xu Yueren stood up and high-five Zhang Huixin: "Hard work!" ”

Then, he walked up to Fang Yao and said softly, "It's finally over, Fang Yao, you have also worked hard." ”