Question

The ages of three cats are a, a+4 and 2a-3. Their total age is 21. Determine a.

Answer 1

Answer:

Ages of cats => a, a+4, 2a-3

Thus,

$a + a + 4 + 2a - 3 = 21 \\ \\ 4a + 1 = 21 \\ \\ 4a = 20 \\ \\ a = 5$

The a is 5.

Answer 2

A+a+4+2a-3= 21

combine like terms

1+4a= 21
-1. -1

4a= 20
————
4a. 4

a= 5