When the sum of a number and 3 is subtracted from 10 the result is 5. Identify the integer.

Question

they have to be worked out

Answer 1

"The sum of a number and 3" is "x+3"

 

Write the problem as a "mathematical sentence" - convert each phrase into the corresponding part of the equation:

 

10 - (x+3) = 5

 

Now solve with algebra:

 

10 - x -3 = 5

7 - x = 5

7 - 5 = x

2 = x

 

x = 2