Question

The sum of a number and 2 times the number is 21

Answer 1

Answer:

7 is the number

Step-by-step explanation:

let number is X

x+2x=21

3x=21

x=7

Answer 2

let the unknown no. be x

another no. = 2x

according to the question,

x+2x=21

3x=21

x=21/3

x=7

another no. = 2x = 2×7 =14