Copier V prints at a rate of 106 letters in every 2 minutes and Copier W prints at a rate of 156 letters in every 6 minutes. At 4 p.m., both copiers started printing. After a while, Copier V stopped printing for some time as the ink cartridges were being changed before it continued to print again. Copier W continued printing during this time. At 7 p.m., the total number of letters printed during the past three hours was 8537. Express the number of letters printed by Copier V as a percentage of the total number of letters printed by both copiers. Round off your answer to 2 decimal places.
Number of letters Copier V prints per min = 106 ÷ 2 = 53
Number of letters Copier W prints per min = 156 ÷ 6 = 26

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

Number of letters printed by Copier W in 4 h
= 180 x 26
= 4680

Number of letters printed by Copier V in 4 h
= 8537 - 4680
= 3857

Percentage of the number of letters that Copier V printed over the total number of letters printed
= ³⁸⁵⁷₈₅₃₇ x 100%
≈ 45.18%

Answer(s): 45.18%