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Nick had 2 identical containers. One container was completely filled with water. The other container was 5/9 filled with syrup.  He used some water and some syrup to make a drink  . He had the same amount of water and syrup left. He used 2/5 l more water than syrup. How much syrup did he have at first ? Give your answer as a fraction in its simplest form .

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I have seen long explanation for this type of questions and I understood them all. The problem is, how can you put that into simple words for the student ? Is there a shortcut to do it ? How can I solve this question in 5 seconds ?  

I`ll leave the scientific explanation to others but if you want to look for a short cut for this type of question, i did a youtube video to explain how you get the answer in just one look.



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(A) When 600cm3 of air is pumped into Flask A, the balance will tip in favor of Flask A.  This is because the additional 600cm3 of air has added to the overall mass of air in Flask A.

(B) The volume of air in Flask A is unchanged at 1000cm3.  This is because the Flask is made of solid glass that cannot expand easily even as the pressure of air in the flask increases.

(C) The experiment demonstrates that air (i) has mass and (ii) can be compressed.

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My 2-cents inputs…

(A) Same observation (but I think there is no need write explanation in the answer since not asked “why”, correct?)

(B) 1000 cm3 (same thing no need explain because no “why”?) But if asked, it is because air has no definite volume and can be compressed to take up the same volume in the flask, rather than due to the material of the glass. [consider another experiment if we pump air into a flask and into a balloon in comparison.]

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