The sum of three and a number is 24

Step-by-step explanation:

whenever you see these questions, just subtract the first number, 3, from the total number. Doing this, 24 - 3 = 21

The number is 21

21

Step-by-step explanation:

let the number be 'x' then,

according to the question,

or, 3 + x = 24

or, x = 24 - 3

therefore , x = 21 ans

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x