How much did they start with?
It was time to send the kids to camp, and Sally and Jim were shopping for supplies. They spent half the money they had plus $4.00 on socks for the kids; half of what was then left plus $3.00 on name tapes; and half of what was then left plus $2.00 on a small wallet for each child. They found themselves with $3.00 left over, so they treated themselves to a glass of iced tea each. How much did they start with? (Hint-work backward.)
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The engineering department was arranging for a rather expensive catered lunch to bid farewell to their retiring colleague. They calculated that it would cost each person $30. One good mathematician remarked, "It's lucky that there aren't five fewer of us to split the...