The perimeter of the ABC triangle is 17/20 m. The AB side is 17/50 m, the BC side is 9/50 m

The perimeter of the ABC triangle is 17/20 m. The AB side is 17/50 m, the BC side is 9/50 m shorter than AB. Find the side length of the speaker.

let’s convert all lengths to decimal fractions, so that it is more convenient to count: P = 17/20 = 85/100 = 0.85; AB = 17/50 = 34/100 = 0.34 difference between m / y BC and AB = 9/50 = 18/100 = 0.18.
Find BC: BC = 0.34-0.18 = 0.16
Find AC: AC = 0.85-0.34-0.16 = 0.35 or 7/20
Answer: AC = 7/20 or 0.35