Copier Y prints at a rate of 102 leaflets in every 2 minutes and Copier Z prints at a rate of 136 leaflets in every 4 minutes. At 6 p.m., both copiers started printing. After a while, Copier Y stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier Z continued printing during this time. At 8 p.m., the total number of leaflets printed during the past two hours was 6935. Express the number of leaflets printed by Copier Y 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 Y prints per min = 102 ÷ 2 = 51
Number of leaflets Copier Z prints per min = 136 ÷ 4 = 34

From 6 p.m. to 8 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of leaflets printed by Copier Z in 6 h
= 120 x 34
= 4080

Number of leaflets printed by Copier Y in 6 h
= 6935 - 4080
= 2855

Percentage of the number of leaflets that Copier Y printed over the total number of leaflets printed
= ²⁸⁵⁵₆₉₃₅ x 100%
≈ 41.17%

Answer(s): 41.17%