Copier V prints at a rate of 81 letters in every 3 minutes and Copier W prints at a rate of 150 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 7354. 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 = 81 ÷ 3 = 27
Number of letters Copier W prints per min = 150 ÷ 6 = 25

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 25
= 4500

Number of letters printed by Copier V in 4 h
= 7354 - 4500
= 2854

Percentage of the number of letters that Copier V printed over the total number of letters printed
= ²⁸⁵⁴₇₃₅₄ x 100%
≈ 38.81%

Answer(s): 38.81%