Question

He sum of a number and twenty-one is sixty-four.

What is the value of the number?

The number equals
.

Answer 1

the number equals 43

Explanation:

We can write the sentence in mathematical terms to get a formula, using "x" for the unknown:

x + 21 = 64

Then we solve for x by subtracting 21 from oth sides of the equation:

x = 64 - 21

x = 43

Answer 2

43

Explanation:

Let's call this number x. The word sum means addition, so we can write x + 21 = 64. When we subtract 21 from both sides, we get x = 43. Hope this helps!