Mrs.Carter bought 7 dry erase markers for $40. How much would 20 markers cost ?
40/7 = x/20
Solve for x.
114.2
To determine the cost of 20 markers, we can set up a proportion using the given information. We know that 7 markers cost $40. Let's set up the proportion:
7 markers cost $40
x markers cost $?
The proportion can be written as 7/40 = x/20.
To find the value of x, we can cross-multiply:
7 * 20 = 40 * x
Simplifying further:
140 = 40x
Finally, we can solve for x by dividing both sides of the equation by 40:
x = 140/40 = $3.50
Hence, 20 markers would cost $3.50.