Question

Sally has seven times as many dimes as nickels. How many nickels does she have?

Their value is $3.00.


4 nickels
7 nickels
28 nickels

Answer 1

She has 4 nickels and 28 dimes


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Answer 2

A) 4 nickels

Explanation:

Given:Sally has seven times as many dimes as nickels.

Let's take "x" be the number of nickels and "y" be the number of dimes.

We know that a dime represents 0.10 cents and a nickel represents .05 cents

Sally has seven times as many dimes as nickels.

y = 7 x ------(1)

0.10 x + .05 y = 3

Multiply by 100 on both sides, we get

10y + 5x = 300 ----(2)

Now we have to solve these two equations.

Now plug y = 7x in the second equation, we get

10(7x) + 5x = 300

70x + 5x = 300

75x = 300

x = 300/75

x = 4

Now plug x = 4 in y = 7x, we get

y = 7×4 = 28

Here x represents the number nickles.

Sally have 4 nickels.