The sides of the triangle are 3x, 4x and 5x
3x + 4x + 5x = 90
12x = 90
x = 90/12
x = 7.5
first side = 3x = 3 * 7.5 = 22.5 cm
second side = 4x = 4 * 7.5 = 30 cm
third side = 5x = 5*7.5 = 37.5 cm
<span>here is what i get :
x/3+11-(1/15)=0 </span>
You have to multiply 3 times 2= 6 + 4 = 10 so the answer is 10 I hope this help...