Question

a bag contains 7 red marbles and 5 black marbles.you must add 60 marbles to the bag but the ratio of the marbles should remain the same how many of each colour should you add?​

Answer 1

let the no. x

then 7x ,5x

• 7x +5x equal 60
• 12x equal 60
• x equal 60/12
• x equal 5
• red 7x5 equal 35
• black 5x5 equal 25