Question

How to solve this problem​

Answer 1

PR = 180 cm

Explanation:

Given PQ : QR = 7 : 3 = 7x : 3x ( x is a multiplier )

PQ - QR = 72, substitute values

7x - 3x = 72

4x = 72 ( divide both sides by 4 )

x = 18

Thus

PR = PQ + QR = 7x + 3x = 10x = 10 × 18 = 180 cm

Answer 2

180

Explanation:

PQ:QR= 7:3

PQ-QR=72

• 7x- 3x= 72
• 4x= 72
• x= 72/4
• x=18
• 7x= 126, 3x= 3*18= 54

PQ= 126 cm, QR= 54 cm

PR= PQ+QR= 126+54= 180 cm