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Sum of a number and its half is 30 then the number is ……..

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Sum of a number and its half is 30 then the number is ……..

(a) 15

(b) 20

(c) 25

(d) 40

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1 Answer

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(b) 20

Let number be x

half of number is x/2

Sum of number and it’s half is given by

x + x/2 = 30 [Multiplying by 2 on both sides]

2x + x = 30 x 2

3x = 60

x = 60/3 = 20

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