Copier M prints at a rate of 120 leaflets in every 4 minutes and Copier N prints at a rate of 120 leaflets in every 6 minutes. At 8 p.m., both copiers started printing. After a while, Copier M stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier N continued printing during this time. At 10 p.m., the total number of leaflets printed during the past two hours was 7885. Express the number of leaflets printed by Copier M as a percentage of the total number of leaflets printed by both copiers. Round off your answer to 2 decimal places.
Number of leaflets Copier M prints per min = 120 ÷ 4 = 30
Number of leaflets Copier N prints per min = 120 ÷ 6 = 20

From 8 p.m. to 10 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of leaflets printed by Copier N in 8 h
= 120 x 20
= 2400

Number of leaflets printed by Copier M in 8 h
= 7885 - 2400
= 5485

Percentage of the number of leaflets that Copier M printed over the total number of leaflets printed
= ⁵⁴⁸⁵₇₈₈₅ x 100%
≈ 69.56%

Answer(s): 69.56%