SOLUTION: Laura has 20 coins consisting of quarters and dimes. If she has a total of $3.05, how many dimes does she have?
Algebra.Com
Question 358419: Laura has 20 coins consisting of quarters and dimes. If she has a total of $3.05, how many dimes does she have?
Found 2 solutions by mananth, robertb:
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
20 coins
dimes & quarters
value 305 cents
let dimes be x
quarters will be 20-x
...
25(20-x)+10x=305
500-25x+10x=305
-15x=-195
/-15
x=13
dimes 13
quarters 7 coins
...
m.ananth@hotmail.ca
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
q+d = 20.
0.25q + 0.10d = 3.05.
The first equation gives q = 20-d. By direct substitution,
0.25(20-d) + 0.10d = 3.05,
5-0.25d + 0.10d = 3.05,
-0.15d = -1.95,
d = 13, q = 7.
RELATED QUESTIONS
Jennie has a jar of 54 coins consisting of dimes and quarters. If she has a total of... (answered by richwmiller)
rebecca has a 20 coin consisting of quarters and dimes. if she has a total of $3.20 how... (answered by JulietG)
Amy has a collection of coins consisting of quarters and dimes. She has twice as many... (answered by josgarithmetic,ikleyn)
a math woman has 57 coins consisting of dimes and quarters. if the value of this money is (answered by TimothyLamb)
Barbara has some dimes and quarters. If she has
29 coins worth a total of
$3.95, how (answered by fractalier)
Laura has $4.50 in dimes and quarters. She has 3 more dimes than quarters. How many... (answered by checkley79)
Laura has $4.50 in dimes and quarters. She has 3 more dimes than quarters. How many... (answered by ankor@dixie-net.com)
georgia has only dimes and quartersin her bag. She has a total of 18 coins that are worth (answered by lwsshak3)
Marcy has a total of 30 dimes and quarters. If the total value of the coins is $5.70, how (answered by lynnlo)