Chain Rule
Tested in 2 real MPSC questions across 1 year (2021–2021). See it in context on the interactive Concept Graph →
Years it was asked
What you need to know first
Real questions that test this
400 माणसे, एका दिवसात 9 तास काम करून त्या कामाचा 1/4 भाग 10 दिवसात पूर्ण करतात. तर दर दिवशी त्याच गतीने 8 तास काम करणारी किती अतिरिक्त माणसे उरलेले काम 20 दिवसात पूर्ण करतील ? 400 persons, working 9 hours a day complete 1/4th of the work in 10 days. How many of additional persons, working 8 hours a day, required to complete the remaining work in 20 days ?
1)(1) 275✓ Correct
2)(2) 250
3)(3) 675
4)(4) 400
Use the man-days formula (M1 * D1 * H1 / W1 = M2 * D2 * H2 / W2). Equate initial conditions with remaining work and find the total men needed, then subtract the initial 400 to find additional men.