Question

A college received 90% of its order of laptop keyboards from a vendor.

Answer 1

Answer:

170

Step-by-step explanation:

Given that: x represents total number of keyboards ordered

                  y represents number of non-defective keyboards

And;

                  y = 0.9x - $\frac{(0.9x)}{18}$    .......................... 1

If the college ordered 200 keyboards, then x = 200. So that substituting the value of x in equation 1, we have;

y = (0.9 x 200) - $\frac{(0.9*200)}{18}$

  = 180 - $\frac{180}{18}$

  = 180 - 10

y = 170

The college received 170 non-defective keyboards.