Question 1162289: jim has $2.70 in dimes and nickels. If she has 9 more dimes than nickels, how many of each coin does she have? Answer by ikleyn(52898) (Show Source):
Take off these extra 9 dimes for a minute.
Then you will have 270-90 = 180 cents in equal number dimes and nickels.
You can group the coins in sets, each containing 1 dime and one nickel.
Each group is worth 10+5 = 15 cents; so, there are = 12 such groups.
It leads you to the answer: the original collection has 12 nickels and 12+9 = 21 dimes.
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and for all methods used - from one equation to two equations and even without equations.
A convenient place to quickly observe these lessons from a "bird flight height" (a top view) is the last lesson in the list.
Read them and become an expert in solution of coin problems.
