Question 999540: May buys combination of stamps of 45 cent and 65 cent she spends 24.50 on 50 how many of each did she buy Found 2 solutions by ikleyn, MathTherapy:Answer by ikleyn(52787) (Show Source):
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Let us assume for a minute that all the stamps cost 45 cents each.
Then the total cost would be 50*45 = 2250 cents = $22.50, which is in $2 less than $24.50.
It is clear that the difference is due to presence of $0.65 stamps that we intently counted as 0.45.
It is also clear that the number of these $0.65 stamps is = = 10 to compensate the difference.
It gives the answer: 10 stamps in 65 cents and 50-10 = 40 stamps in 45 cents.
You can put this solution on YOUR website!
May buys combination of stamps of 45 cent and 65 cent she spends 24.50 on 50 how many of each did she buy
Let number of .45 stamps purchased be F
Then number of 65c stamps purchased = 50 - F
We then get: .45F + .65(50 - F) = 24.5
.45F + 32.5 - .65F = 24.5
.45F - .65F = 24.5 - 32.5
- .2F = - 8
F, or number of 45c stamps purchased = , or
Number of 65c stamps purchased: 50 - 40, or
