Question

The three sides of a triangle are in the ratio 2:3:5. If the longest side of the triangle is 45m, find the perimenter of the triangle

Answer 1

longest side = 45 m

5/10 = 45m
1/10 = 9m
10/10 = 90 m.

the perimeter is 90m

Answer 2

2:3:5
x:y:45

5 is multiplied by 9, so you multiply the other 2 numbers by 9 too.
 
x = 2×9 = 18
y = 3×9 = 27