simultaneous equations

using simultaneous equations solve these problems

a)  A moneybox contains only 20-cent coins and 50-cent coins. If there are

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57 coins in the moneybox and their total value is $24.30, how many 20-

cent coins and how many 50-cent coins are there?

b) Twelve years ago Jack was five times as old as Jill. In 3 years’ time

Jill will be half of Jack’s age. What are Jack and Jill’s present ages?