book Maths Puzzle Numerical Ability

How do i find 2/3 of the supplement

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book Other Question

Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have?

Thank You
BOB AND MARY TOGETHER SELL 22 APPLES
BOB AND DON SELL 14 APPLES
DON AND MARY SELL 16 APPLES
HOW MANY DID EACH SELL? THANK YOU