SOLUTION: Edna has saved P4.50 for the week consisting of 5 centavo and 10 centavo coins. How many 10 centavo coins does she has if she has 6 more 10 centavo coins than 5 centavo coins?

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Question 1124338: Edna has saved P4.50 for the week consisting of 5 centavo and 10 centavo coins. How many 10 centavo coins does she has if she has 6 more 10 centavo coins than 5 centavo coins?
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
n = number of 5 centavo coins
d = number of 10 centavo coins

5n + 10d = 450
d = n + 6

Plug in the second equation into the first.

5n + 10n + 60 = 450
15n = 390
n = 26

Edna has 26 five-centavo coins and 32 ten-centavo coins.