SOLUTION: Questions & answers Transpose the formula to find s---->Question : a=2(ut-s)/t^2 I got s=l^2(2(ut-s) Word__Problem a)When five is taken from six times a certain number

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Question 596026: Questions & answers
Transpose the formula to find s---->Question : a=2(ut-s)/t^2
I got s=l^2(2(ut-s)

Word__Problem
a)When five is taken from six times a certain number the result is fifteen.What is the number?
I GOT
LET X BE THE CERTAIN NUMBER
6X-5=15
6X=15+5
6X=20
X=20/6

b)Sidney paid a grocery bill of $3.90 with dimes and quarters.If there were 4 more dimes than quarters,how many coins of each kind did he have? Not sure how to attempt this?
Answer by jim_thompson5910(35256) (Show Source):
You can put this solution on YOUR website!
# 1

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# 2
You're very close to the final answer. Reduce to get

20/6 = 10/3

So the answer is 10/3

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Let d = # of dimes and q = # of quarters

"If there were 4 more dimes than quarters", then

The total value of d dimes is 0.1d dollars
The total value of q quarters is 0.25q dollars
They must add to 3.90, so

0.1d + 0.25q = 3.90

Multiply everything by 100 to get

Now use this equation (along with the first) to solve for d and q

... Replace 'd' with 'q+4' (since d = q+4)

So there are 10 quarters.

and there are 14 dimes