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math
can someone do this math problem for me and show all the work i tried about a million times and i cant remember how to get it done.
viki has $2.80 in quarters and dimes. The number of dimes is 7 less than the number of quarters. find the number she has of each kind.
please help. ill rate 5
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okay you make a box thing and put q and d for quarters and dimes then make three boxes liek this and write n for number p for price and t for total. Then put q under number because you dont know how many quarters you have then 25 for price because a quarter is 25 cents then for dime put q-7 in the box for number because you know its 7 less than quarter but you dont know what quarter is then put 10 for price because a dime is wroth 10 cents.. then you multiply number by price boxes which gives you 25q and 10q-70.. make that an equation set equal to 280
______N____P__T_________
q | q | 25 | 25q |
d | q-7 | 10 | 10q-70|
-------------------------
25q + 10q-70 = 280
35q - 70 = 280
+ 70 +70
===============
35q = 350
divide those which gives you
q = 10
so you have 10 quarters and subtract that 7 from that.. which is 3 dimes
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Viki has 10 quarters and 3 dimes, which equals $2.80.
I really don't know how I solved this because these type of math problems are easy to me. Well, 10 quarters is the same as $2.50 and if Viki needed to have dimes that were 7 less than the number of quarters, then she has 3 dimes and 10 quarters. If you covert these into cents and dollars, the total sum is $2.80.
That was sort of confusing; I gave you the answer and now you just have to reword the explanation of how I got it.
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