book Maths Puzzle Numerical Ability

Does a negative / a negative = a positive?

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western state is 18 yrs older than southern state. western is 2.5 times as old as southern. how old is each. choices for southerns state age 12, 14 and 18 thank you I am confused with this problem A woman bought some large frames for $15 each and some small frmaes for $8 each at a closeout sale. If she bought 22 frames for $239, find how many