Answer:
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
