Copier J prints at a rate of 95 leaflets in every 5 minutes and Copier K prints at a rate of 128 leaflets in every 4 minutes. At 4 p.m., both copiers started printing. After a while, Copier J stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier K continued printing during this time. At 7 p.m., the total number of leaflets printed during the past three hours was 8385. Express the number of leaflets printed by Copier J 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 J prints per min = 95 ÷ 5 = 19
Number of leaflets Copier K prints per min = 128 ÷ 4 = 32

From 4 p.m. to 7 p.m. = 3 h
1 h = 60 min
3 h = 180 min

Number of leaflets printed by Copier K in 4 h
= 180 x 32
= 5760

Number of leaflets printed by Copier J in 4 h
= 8385 - 5760
= 2625

Percentage of the number of leaflets that Copier J printed over the total number of leaflets printed
= ²⁶²⁵₈₃₈₅ x 100%
≈ 31.31%

Answer(s): 31.31%