Question

The sum of two number is 18. If one is twice the other, find the number solve

Answer 1

Answer:

let the 2nd number be X and the 1st number be 2x.

2x+x=18

3x=18

x=18/3

x =6

2x=6*2=12

therefore,

1st number is 12.

2nd number is 6.

Answer 2

Suppose two number is x and y.

From Question,

x + y = 18 ----------(equation 1)

x = 2y --------------(equation 2)

Put (x = 2y) in equation 1

2y + y = 18

3y = 18

y = 6

put y = 6 in equation 1.

x + 6 = 18

x = 18 - 6

x = 12