Multiple choice

A can do a work in 20 days and B in 10 days. If they work on it together for 5 days, then what fraction of work is left. A एक काम 20 दिन में और B, 10 दिन में करता है। यदि वे दोनों 5 दिन साथ मिलकर काम करें, तो काम का कितना भाग शेष रह जायेगा?

  1. 4/9

  2. 1/4

  3. 1/5

  4. 2/9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A's 1-day work = 1/20, B's 1-day work = 1/10. Combined 1-day work = 1/20 + 1/10 = 3/20. In 5 days, they complete 5 × 3/20 = 3/4 of work. Remaining work = 1 - 3/4 = 1/4.

Keep practicing — related questions