the sides of a triangle is 9,12,15cm..Find the sides of a similar triangle if the longest side is 20 cm

Answer 1

a/9 = b/12 = 20/15

easy to find a and b

or

(9,12,15) = 3(3,4,5)
(?,?,20) = 4(3,4,5)

Answer 2

12
16
20