3:8=3x:8x
So 3x+8x=77
11x=77
x=7
3x=21, 8x=65
21:56
£21 and £56
sum the parts of the ratio 3 + 8 = 11
divide £77 by 11 to find 1 part of the ratio
[tex]\frac{77}{11}[/tex] = £7 ← 1 part of the ratio
3 parts = 3 × 7 = £21
8 parts = 8 × 7 = £56
