SOLUTION: A cash register contains only five dollar and ten dollar bills. It contains twice as many five’s as ten’s and the total amount of money in the cash register is 600 dollars. How
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Question 1145628: A cash register contains only five dollar and ten dollar bills. It contains twice as many five’s as ten’s and the total amount of money in the cash register is 600 dollars. How many ten’s are in the cash register? Answer by ikleyn(52786) (Show Source):
Group (mentally) all banknotes in sets, each containing 2 5-dollar bills and one 10-dollar bill.
Each group is worth 5+5+10 = 20 dollars.
Hence, there are 600/20 = 30 such groups.
Therefore, a cash register has 30 10-dollar bills and 2*30 = 60 5-dollar bills. ANSWER
You will find there the lessons for all levels - from introductory to advanced,
and for all methods used - from one equation to two equations and even without equations.
Specifically for grouping method, see the lesson marked (*) in the list.
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.
