Work equivalence (x men = y women or n men or m women): days for a mixed group

This type of question, asked 4 times: 20 Jul 2023 S1, 26 Jul 2023 S1, 21 Sep 2025 S2, 23 Sep 2025 S2. All 4 questions below, oldest first.

Try each one first, then open its answer.

Question 1
20 Jul 2023 S1
75 $If one man or two women or three boys can finish a work in 121 days, then how many days will one man, one woman and one boy together take to finish the same work?$
Tap an option to check your answer.
Question 2
26 Jul 2023 S1
59 $4 men’s work is equal to 6 women’s work, and 4 women’s work is equal to 6 boys’ work. A boy can finish the work in 60 days. In how many days can the work be finished by a man and a woman together?$
Tap an option to check your answer.
Question 3
21 Sep 2025 S2
62 $A group of 5 men or 12 women can complete a task in 70 days. Find the time taken by 5 men and 12 women to complete the task.$
Tap an option to check your answer.
Question 4
23 Sep 2025 S2
65 $If 10 men or 15 women can complete a work in 170 days, how long will 20 men and 20 women take for completing the same work?$
Tap an option to check your answer.

Question 1