1.

Find the missing number in the box [ ] in the proportion:3/5 = [ ]/20

Answer»

Let us assume the missing number be y.

Then, (3/5) = (y/20)

By cross multiplication we get,

(3 × 20)/5 = y

Y = 60/5

Divide both numerator and denominator by 5.

Y = 12

Therefore, 3/5 = [12]/20



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