Ratio and Proportion Practice Test 4

Question : 21 of 40

Marks: +1, -0

What number should be added to each of 6, 14, 18 and 38 so that the resulting numbers make a proportion?

Solution:

Let x be the number added to each number to make a proportion.

(14+x)(18+x)=(38+x)(6+x)

252+18x+14x+x^2=228+6x+38x+x^2

252-228=44x-32x

x=2

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