Question 918059

first = x +10
second = x 
third = 3x

the perimeter is the sum of the 3 sides = 45

x +10 + x + 3x = 45

5x +10 = 45

5x = 35

x= 7

first=  7+ 10 = 17
second = 7
third = 3*7 = 21