A box contains red and black marbles in the ratio 3:5. If there are 40 more black marbles than red, how many marbles are there in total?
Show answer & explanation
Correct answer: B
Explanation
Red : Black = 3 : 5, Difference = 40
2 parts = 40
1 part = 20
Red = 3 × 20 = 60
Black = 5 × 20 = 100
Total marbles = 60 + 100 = 160