A school ordered 3 large boxes of board markers. After giving 15 markers to each of 3 teachers, there were 90 markers left. How many markers were originally in the box?
Step-by-step explanation: Initially, the school had 3 boxes of board markers, and each box had X board markers, where X is the number we want to find. Then the initial number of board markers is 3*X. We know that after giving 15 markers to 3 teachers, we have other 90 markers left. This can be written as: total markers = markers for the teachers + markers left 3*X = 15*3 + 90 = 45 + 90 = 135 now, we divide both sides by 3. X = 135/3 = 45 From this, we know that in each box we have 45 markers
