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

Mathematics

2 answers:

OleMash [197]3 years ago

7 0

Answer:

Step-by-step 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!

Sloan [31]3 years ago

3 0

Answer:

the number equals 43

Step-by-step 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

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