Multiple choice

If one man or two woman or three boys can do a piece of work in 55 days, then one man, one woman and one boy together will do it in how many days? यदि एक पुरूष अथवा दो स्त्रियां अथवा तीन बालक किसी कार्य को 55 दिनों में कर सकते हैं तो एक पुरूष, एक स्त्री और एक बालक एक साथ इस कार्य को कितने दिनों में कर लेंगे?

  1. 20 days/दिन

  2. 30 days/दिन

  3. 40 days/दिन

  4. 50 days/दिन
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

1 man's work = 55 days, so rate = 1/55 per day. 2 women = 1 man, so 1 woman's rate = 1/110 per day. 3 boys = 1 man, so 1 boy's rate = 1/165 per day. Combined rate = 1/55 + 1/110 + 1/165 = (6 + 3 + 2)/330 = 11/330 = 1/30. Time = 30 days.

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