The triangles are similar.

what is the value of x?

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21 is the value of x. the bigger triangle is three times the size of the smaller rectangle. so you multiply all of the sides of the smaller triangle by 3 to get the sides of the bigger triangle.

If there are four friends then each would get, 1.25 or 1 1/4. so this is how i solved 5 ÷ 4 = 1.25 . hope this ; )