dinesh saved a total of 132 pieces of 50 cents, 20 cent and 5 cent in his piggy bank. He had 5 fewer 50 cent coins than 20 cent coins. The number of his 5 cent coin was 3 times the total number of 50 cent and 20 cent coins. 

a) How many 20 cent coins did Dinesh have?

b) what was the total value of his 5 cent coins?

someone please help me out!!