Copier U prints at a rate of 112 brochures in every 2 minutes and Copier V prints at a rate of 138 brochures in every 6 minutes. At 1 p.m., both copiers started printing. After a while, Copier U stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier V continued printing during this time. At 3 p.m., the total number of brochures printed during the past two hours was 7420. Express the number of brochures printed by Copier U as a percentage of the total number of brochures printed by both copiers. Round off your answer to 2 decimal places.
Number of brochures Copier U prints per min = 112 ÷ 2 = 56
Number of brochures Copier V prints per min = 138 ÷ 6 = 23

From 1 p.m. to 3 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of brochures printed by Copier V in 1 h
= 120 x 23
= 2760

Number of brochures printed by Copier U in 1 h
= 7420 - 2760
= 4660

Percentage of the number of brochures that Copier U printed over the total number of brochures printed
= ⁴⁶⁶⁰₇₄₂₀ x 100%
≈ 62.80%

Answer(s): 62.80%