Question

Help please ..............Catie is 3 years older than her brother. The sum of their ages is no more than 31.

Answer 1

How old is the brother?

Answer 2

Call 'C' Catie age, and 'B' the brothers age...

Catie is 3 years older than her Brother...
C = B + 3

The sum of their ages is no more than 31...
\[C + B \le 31\]

Answer 3

Put the first one in for C in the second.

\[B + 3 + B \le 31\]
\[B \le 14\]

The Brother B is less than or equal to 14, so Catie is less than or equal to 14 + 3 = 17

Answer 4

okay thank you :)