If x : y = 2 : 5 , then find 3x : 5y
5 kg
6 : 25
2 : 3
12 : 20
Given that x : y = 2 : 5
∴ xy = 25 ______________ (1)
Since we need to find 3x : 5y = 3x5y
Multiplying both sides of 1 by 35 , we have
35 × xy = 35 × 25
35 = 625
Hence 3x:5y = 6:25
If (3x+5y)(3x–5y)=73, find x:y.
If (3x + 5y)/(3x – 5y) = 7/3, find x:y.