Aptitude - Time and Work - Discussion

Discussion Forum : Time and Work - General Questions (Q.No. 1)

Time and Work

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

Answer: Option

Explanation:

A's 1 day's work =	1	;
	15

B's 1 day's work =	1	;
	20

(A + B)'s 1 day's work =		1	+	1		=	7	.
		15		20			60

(A + B)'s 4 day's work =		7	x 4		=	7	.
		60				15

Therefore, Remaining work =		1 -	7		=	8	.
			15			15

Discussion:

344 comments Page 27 of 35.

Lohith said: 5 years ago

How (1/15+1/20 )= 7/60? Explain, please.

Mani said: 1 decade ago

Still i have confusion. How 7/60 comes?

Sai kishore said: 1 decade ago

Still I have confusion. How 7/60 comes?

Bhargav said: 10 years ago

I don't understand why we take 1-7/15?

Santhosh said: 8 years ago

Can anyone explain this in LCM method?

NISHA said: 8 years ago

Why sub this (1-7/15) can you explain?

Bha said: 12 months ago

Thanks all for explaining the answer.

(23)

Trupti said: 1 decade ago

Thanks Parthiban. I understood well.

Dhanalakshmi said: 8 years ago

Thanks for your explanation @Swetha.

Priya said: 10 years ago

Can you explain how this 7/15 came?

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