Answer:
Ruth receives £150
Explanation:
sum the parts of the ratio, 3 + 5 + 7 = 15 parts
divide the total £750 by 15 to find the value of one part of the ratio
£750 ÷ 15 = £50 ← value of 1 part of the ratio
Then
3 parts = 3 × £50 = £150 ← amount Ruth receives