Question

help me plz guys every evening jenna empties her pockets and puts her change in a jar. at the end of the week she counts her money. one week she had 40 coins all of them dimes and quarters. when she added them up, she had a total of $7.75. let d = number of dimes and q =number of quarters. how many dimes did jenna have?

Answer 1

25 quarters and 15 dimes

Answer 2

so it would be 15 dimes

Answer 3

what?! well thats a stupid question Jenna had 0 dimes because 7.75 can be made in quarters

Answer 4

25 x .25 = 6.25
15 x .10 = 1.50
6.25 + 1.50 = 7.75

Answer 5

Let Q = the number of quarters and D = the number of dimes.
Then:
1) Q+D = 40 "One week she had 40 coins, all of them dimes and quarters...."
2) 0.25Q+0.1D = $7.75 "...she had a total of $7.75."
Rewrite equation 1) as: D = 40-Q and substitute into equation 2).
2a) 0.25Q+0.1(40-Q) = 7.75 Simplify the left side.


2b) 0.25Q+4-0.1Q = $7.75 Subtract 4 from both sides.
2c) 0.25Q-0.1Q = 3.75 Combine the like-terms on the left side.
2d) 0.15Q = 7.75 Divide both sides by 0.15
2e) Q = 25 and:
D = 40-Q
D = 40-25
D = 15
Jenna had 25 quarters and 15 dimes. nvm

http://www.algebra.com/algebra/homework/Problems-with-consecutive-odd-even-integers/Problems-with-consecutive-odd-even-integers.faq.question.204097.html

Answer 6

I forgot to notice that there were 40 coins :p

Answer 7

(:

Answer 8

i will give you guys a another problem if you want

Answer 9

sure why not

Answer 10

unfortunately i'm going to be leaving soon, i have to go pick my cat up from the vet .

Answer 11

alex stocks up for winter. he buys 24 cans of vegetables. he pays 80 cents per can for tomatoes and 40 cants per can for corn, for a total cost of $12.80. how many cans of corn does he buy?

Answer 12

Let t = # cans tomatoes and c = # cans corn
t + c = 24 subtract c from both sides
c = 24 - t
80(t) + 40(c) = 1280 substitute in for c
80(t) + 40(24-t) = 1280
80t + 960 - 40t = 1280 subtract 960 from both sides
40t = 320
t = 8
c = 24 - t = 24 - 8 = 16
check work
80(8) + 40(16) = 1280
640 + 640 = 1280
1280 = 1280
He bought 16 cans of corn

http://answers.yahoo.com/question/index?qid=20110524130003AAkBnoa

Answer 13

ok well it was good having you here or I would have given the wrong answer lol @ilyautumn

Answer 14

it is alright if i get the wrong answer

Answer 15

haha no its not id feel bad lol

Answer 16

i could aways take the test again

Answer 17

haha id still feel bad if you would have to take the test again

Answer 18

yea

Answer 19

this is my last question george and carmen went on a bicycle trip. they took a bus to their starting point, and then biked the rest. they travled 325 kilometers in total, and they biked kilometers more than they were bussed. let x = kilometers travled by bike and y = kilometers travled by bus. find how many kilomteers they travled by bike.