Equal concept?

by Angie
(Singapore)

There were 920 spectators in the sports hall watching a badminton match. After 2/5 of the children and 2/7 of the adults left the hall, the number of children and the number of adults remaining in the hall were the same. How many children remained in the hall?


How can I show my girl the solution via models?

Zach's Answer:

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Jul 30, 2021
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starstarstarstarstar 		平等概念
by: Anonymous

3/5和5/7相等，3和5的最小公倍数15，所以儿童一共是25小份，大人是21小份，即46份是920，一小份是20，20*15等于300人，儿童留在大厅是300人

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