Copier V prints at a rate of 80 letters in every 5 minutes and Copier W prints at a rate of 126 letters in every 6 minutes. At 7 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 9 p.m., the total number of letters printed during the past two hours was 5106. 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 = 80 ÷ 5 = 16
Number of letters Copier W prints per min = 126 ÷ 6 = 21

From 7 p.m. to 9 p.m. = 2 h
1 h = 60 min
2 h = 120 min

Number of letters printed by Copier W in 7 h
= 120 x 21
= 2520

Number of letters printed by Copier V in 7 h
= 5106 - 2520
= 2586

Percentage of the number of letters that Copier V printed over the total number of letters printed
= ²⁵⁸⁶₅₁₀₆ x 100%
≈ 50.65%

Answer(s): 50.65%