Question

The sum of three consecutive multiples of five is945 . Find the largest multiple.

Answer 1

let the first multiple be 5x
so second = 5x +5
third = 5x +10
given
$5x + 5x + 5 + 5x + 10 = 945 \\ 15x + 15 = 945 \\ 15x = 945 - 15 \\ 15x = 930 \\ x = 930 \div 15 \\ x = 62$
5x = 5×62 = 310
$5x + 5 = 310 + 5 = 315 \\ 5x + 10 = 310 + 10 = 320$
hope it helps