SOLUTION: The number of 5p coins in a money box is two less than three times the number of 10p coins. If the total value of the coins is £4.40, how many 5p coins are there in the box?
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Question 987383: The number of 5p coins in a money box is two less than three times the number of 10p coins. If the total value of the coins is £4.40, how many 5p coins are there in the box? Answer by macston(5194) (Show Source):
You can put this solution on YOUR website! x=number of 5p coins; y=number of 10p coins=3x+2
5x+10y=440
5x+10(3x+2)=440
5x+30x+20=440
35x=420
x=12
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ANSWER: There are twelve 5p coins
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CHECK:
5x+10y=440
5(12)+10y=440
60+10y=440
10y=380
y=38 There are 38 10p coins.
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y=3x+2
38=3(12)+2
38=36+2
38=38
