The sum of half of a number and 4 / 15 of 60 is 40. What's the number?

Let this number be X
x/2+60*4/15=40
x/2+16=40
x/2=24
x=48

△△□□□△△□□□…… If there are 40, then there must be 60

Wrong. When there is the fortieth triangle, there can be one or two or three squares behind it. That is to say, there may be 58, 59 or 60 squares

1 / 4 of a number is 5, this number is 5 / 4

cuo

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