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3 years ago

9

Sally has twice as many dimes as nickels. The total value is $3.50 how many nickels and dimes does she have?

2 answers:

leonid [27]3 years ago

5 0

2n=d
nickel is 0,05 dollars dime is 0.1 dollars
0.05(n)+0.1(2n)=3.5
0.25n=3.5
n=14
d=2(14)=28
hope u can understand

Murljashka [212]3 years ago

3 0

D=2n
.05n+.1d=3.5
I multiplied the nickels and dimes by these values because that is their actual monetary value
.05n=3.5-.1d
multiply everything by 20
n=70-2d
d/2=70-2d
.5d+2d=70
2.5d=70
d=28
n=14
so there are <u>28 dimes and 14 nickels
</u>checking this answer
28 dimes = $2.8
14 nickels = .70
2.8+.7=3.5

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