Maths

//Maths//

I need help!

Ken had $20 more than Mingli at first. After Ken had given 1/5 of his money to Mingli, Mingli had $64. How much did Mingli have at first?

Three girls shared a sum of money. Cathy received $180 more than Betty. The total amount Betty and Cathy received was 3 times the amount Alice received. The amount Alice and Cathy received was 5 times the amount Betty received. What was the sum of money shared by the 3 girls?

Someone help me! I am able to solve both questions, but in both, I used simultaneous equation! Anyone who knows how to solve these 2 questions in such a way that a P5 students can understand, tell me!