If the rulers cost $8.50 more than the erasers, and the erasers cost $4.75 more than the chalk, how much does the chalk cost the total spent was $72.00

Answer 1

Based on this question, you can set up a bunch of related equations to help you find how much the chalk cost.

Let x be the chalk cost, y be the erasers cost, and z be the rulers cost. Based on the information we have, we can write the following equations:

y = x + 4.75

z = y + 8.50 = (x + 4.75) + 8.50

x + y + z = 72.00

Now, substitute y and z in terms of x for the third equation, and then solve for x.

x + (x + 4.75) + (y + 8.50) = 72.00

x + (x + 4.75) + ((x + 4.75) + 8.50) = 72.00

3x + 18.00 = 72.00

3x = 54.00

x = $18.00

The chalk cost $18.00