GRE Exam Numerical Ability Time and Work

Eighteen men can complete a work in 10 days. After they have worked for 6 days, 6 more men join them. How many days will they take to complete remaining work? [A] 3 [B] 2 [C] 4 [D] 5

Read Solution (Total 1)

18 men worked for 6days=(18*6)/(6/10)
added 6 more men to 18men = 24 men
remaining work left =4/10

we have to find no. of days=> (18*6)/(6/10)=(24*days)/(4/10)
Days=3
Answer is A
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GRE Other Question

A baseball is thrown up in the air from an initial height of 6 feet. Its height above the ground (in feet) t seconds after being thrown is given by the function h(t)=-16t^2+46t+6. How long will it take (in seconds) for the baseball to hit the ground?
A) 2 seconds B) 5/2 seconds c) 3 seconds D) 4 seconds If mx + qy − nx − py = 0, p − q = 3, and x/y = -2/3 , then which of the following is true?
A) n + m = 9/2 B) n - m = 2 C) m + n = 2 D) m - n = -9/2