RRB Technician Grade III · 26 Dec 2024 · Shift 3 — Mathematics
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1 Mathematics questions from RRB Technician Grade III · 26 Dec 2024 · Shift 3, with answers and Hindi and English explanations.
1.
A और B किसी कार्य को 2 दिन में पूरा करते हैं। यदि A अकेले उस कार्य को 4 दिन में कर सकता है, तो B अकेले उसी कार्य का 20 गुना कार्य ______________ (दिन) में कर सकता है।
A and B complete a work in 2 days. If A alone can do it in 4 days then, B alone can do 20-times of the same work in ______________(days).
- (A)5
- (B)4
- (C)80
- (D)81
Show answer and explanation
Answer: (C)
80
B का 1 दिन का कार्य = 1/2 − 1/4 = 1/4, अतः B अकेले 4 दिन में कार्य करता है। 20 गुना कार्य में 20 × 4 = 80 दिन लगेंगे।
B's 1-day work = 1/2 − 1/4 = 1/4, so B does the work alone in 4 days. 20 times the work takes 20 × 4 = 80 days.
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