Maths · Chapter 13
Unitary Method and Chain Rule PYQs
Find the value of one, decide more or less for every column, and most word problems of arithmetic open up.
Unitary method: value of one, then of many 5 PYQs
- If 4 lines of a print, in a column of a book, contain 36 words, how many words will a column of 50 lines contain?RRB Group D 2026 · 02 Feb 2026
- If 4 lines of a print, in a column of a book, contain 63 words, how many words will a column of 52 lines contain?RRB Group D 2025 · 22 Dec 2025
- A large ship consumes 0.2 litres of fuel per km, and a smaller ship consumes 0.15 litres per km. If the large ship travels 500 km and the small ship…SSC Selection Post 2025 · 25 Jul 2025
- A car covers a distance of 45.6 km in 2.4 litres of petrol. How much distance will it cover in 1 litre of petrol?Other exams 2024 · 24 Jun 2024
- If a car covers 90 km using 4 litres of petrol, how much distance (in km) will it cover using 32 litres of petrol?Other exams 2024 · 25 Jun 2024
Inverse variation in word form — the product stays fixed 6 PYQs
- If 9 workers can build a wall in 12 days, how many days will 6 workers take to build the same wall, assuming they work at the same rate?RRB NTPC 2026 · 08 May 2026
- If 6 men can complete a work in 16 days, how many men are required to complete the same work in 12 days?SSC Selection Post 2025 · 30 Jul 2025
- 16 men can complete a work in 15 days. How many men are required to complete the same work in 10 days?SSC Selection Post 2025 · 24 Jul 2025
- If 8 workers can build a wall in 10 days, how many days will 4 workers take to build the same wall?SSC CHSL 2025 · 30 Nov 2025
- A camp has provisions for 48 persons for 12 days. In how many days will the same provisions finish off if the strength of the camp is increased to…RRB Group D 2025 · 28 Nov 2025
- 8 men can complete a work in 12 days. How many men are required to complete the same work in 6 days?SSC Selection Post 2025 · 01 Aug 2025
Inverse variation after a change midway — provisions and stock 3 PYQs
- 100 men have provisions for 27 days. If 25 men have left, for how many days the same provisions would last for the remaining men?RRB NTPC 2026 · 27 Mar 2026
- There are 1000 men in a group. They have food for 60 days. After 10 days, 500 men left the group. For how many days will the remaining food last?SSC GD 2026 · 09 May 2026
- A military camp has provisions for 360 soldiers for 50 days. After 10 days, 120 more soldiers arrive at the camp. Assuming the daily consumption per…RRB NTPC 2026 · 16 Jun 2026
Chain rule with mixed columns — the more–less rule on work 6 PYQs
- 50 men can build a wall in 30 days working 6 hours per day. How many men will be required to build the same wall in 45 days working 4 hours per day?SSC GD 2026 · 18 May 2026
- 15 men can complete a work in 40 days. How many men can complete (1/2) part of the same work in 20 days?SSC GD 2026 · 19 May 2026
- 40 persons begin to work together on a job. But after some days 10 persons left the work. As a result, the job which should have been completed in…RRB NTPC 2026 · 09 May 2026
- 38 men can do a piece of work in 10 days. Find the time required by 10 men to do thrice the work.SSC CHSL 2025 · 24 Nov 2025
- 24 men can complete a work in 90 days. 36 men will complete 50 percent of the same work in how many days?SSC MTS 2025 · 20 Feb 2025
- A contractor agreed to complete a job in 74 days. He employed 21 men to work, but only one-fourth of the work was completed in 32 days. How many…RRB Group D 2025 · 27 Dec 2025