You in advance: -) sally has seven times as many dimes as nickels. their value is $3.00. how many nickels does she have?

12 nickles

Step-by-step explanation:

24 dimes = $2.40

12 nickles = .60

$2.40 + .60 = $3.00

4 Nickels

28 dimes

Step-by-step explanation:

What do we know?

1 dime = $0.10 and 1 nickel = $0.05

We can set up an equation that states:

7x (0.10) + x (0.05) = 3.00

Multiplying out we get:

.70x + .05x = 3.00

If you don't like the decimals you can multiply the entire equation by 100 to get rid of them; you would be left with

70x + 5x = 300

Combine the x terms

75x = 300

Divide both sides by 75

x = 4

Now we use this value with our originally given information. We were told that Sally had 7 times as many dimes as she had nickels so

Dimes equal = 7(x) or 7(4) = 28

Nickels equal = x which was 4

We can check this:

28 dimes would equal = $2.80 and 4 nickels would equal $0.20; adding these two amounts together and it equals $3.00