hope this helps

Thanks Wen Kiat for giving such detailed explanation.

My answer is 36cm lol!! What's correct answer?

I noted from your working that you have made the assumption that after pouring water from Tank A to B, the percentage of water left in both tanks is 62.5%. This assumption might not be true as both tanks do not have the same base area.

It's true they don't have same base area. But the question says they have same water level. So the water level is the assumption against the height.

At first water level at A is 75%, water level at B is 50%, after A pours to B, water level the same, so should be 62.5 %.

Yes, I agree that the water level should be 62.5% based on how we answer for past questions. I think students are also taught in school to follow this assumption. However, do note that there is criteria for this assumption to be true. Kindly review the criteria and determine the appropriateness to use the assumption in this question.

Hi Wen Kiat I note your workings. Your workings of volume of tank A ( before pouring over to tank B at 10800 x 8/12 )= 7200 cm2 is questionable because 10800cm2 is volume of tank B after pouring from tank A. Your assumption was using the after poured volume of tank B 10800 using the relative rate differences of tank A n B to find volume of tank A before pouring. This assumption would be right if 10800cm2 is the volume of tank B before A pours to B. Hence the volume of water at tank A n B at first before pouring may not be 18000 ( 10800+ 7200) .

1unit is 49+39= 88 5 units 88x5= 440 He spent $440 on food.

This is my solution😁

Oh.. Your solution is more suitable for primary level :)

Mayuree Thongpan.. Your solution is as equally good.. Showed both yours and Jacqueline Teo Mei Hui..to my daughter... She understand yours though I myself prefer Jacqueline's.. So both are equally good by using the perimeter of the rectangle to find areas of respective squares.. Thanks to both of you!!

Sorry careless mistake. Took the wrong figure to minus. Shd take 352 cos that is the actual amt she had. Thanks Mayuree Thongpan i realise my mistake after checkg against yr ans. 😛

Thks 😉

384 divided by 4 is 96.Number of Adults =96

Why divide by 4? Thanks

If there were 128 adults at first, then the number of children must be 256. The difference between the number of adults from the number of children is 128. After the same number of adults and children left the party, though the number of children became 5 times the number of adults, the difference between the two will still be 128. Thus, 128 is 4 units. 1 unit is 32 which means in the end, there were 32 adults left. Finally 128 - 32 = 96. 96 adults left the exhibition. This problem is commonly known as before and after - constant difference where in the difference at the beginning is the same as the difference in the end. Hope it helps.. :)

Ratio

Thanks Jojo Celestino for yr detailed explanation.

Think this should fall under "difference being the same"

[apologies comment not answering question] ... just wishing Teacher can be kinder and not mark with such "prominent crosses" and across the child's work. . . rather demoralising :(