NEED AN ANSWER TO THIS MATH PROBLEM (i only need the equation)?

Question

*WRITE AND SOLVE AN EQUATION FOR THE PROBLEM BELOW*

joe has $5.15 in nickels. if he has $7.90 in total how many quarters does he have?

Answer 1

Assuming that all he doesn't have in nickels he has in quarters, he has 7.90-5.15=2.75 in quarters.

Joe has x quarters.

0.25*x = 7.90 - 5.15

<=> 0.25*x = 2.75

<=> x = 2.75 / 0.25

<=> x = 11

Joe has 11 quarters. (Again, assuming that all he doesn't have in nickels he has in quarters)

Answer 2

You cannot do this unless you assume that there are only nickels and quarters.   If this is so, then   7.90 = 5.15 + 0.25X

Answer 3

I am assuming the rest of the money besides the $5.15 is quarters.

5.15 + 0.25x = 7.90

"x" being the number of quarters