Question

15.)If 1/2 is added to a number and the sum is multiplied by 3, the result is 21. Then the number is :

Answer 1

Step-by-step explanation:

let the number be a.

(a+1/2)3=21

a+1/2=21/3

a+1/2=7

a=7-1/2

a=13/2

Answer 2

Answer:

13/2

Step-by-step explanation:

Let the number be x.

==: (x + 1/2) * 3 = 21

==: x + 1/2 = 7

==: x = 7 - 1/2

==: x = 13/2

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