On a certain assembly

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figs: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Mon Mar 30, 2009 9:00 am; Thanked: 2 times

On a certain assembly

by figs » Mon May 25, 2009 4:22 am

On a certain assembly line, the rejection rate for Monday’s production was 4 per cent, for Tuesday’s 8 per cent, and for the two days combined 7 per cent. What was the ratio of Tuesday’s production to Monday’s production?

A. 3/1

B. 2/1

C. 1/1

D. 1/2

E. 1/3

oa..later

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Source: Beat The GMAT — Problem Solving | Mon May 25, 2009 4:22 am

Giorgio: Master | Next Rank: 500 Posts; Posts: 182; Joined: Sat Apr 11, 2009 4:55 am; Thanked: 11 times

by Giorgio » Mon May 25, 2009 5:27 am

Should be something like this:

0.04X+0.08Y=0.07
X+Y=1

Resolve and you get:
X=1/4 Y=3/4

Y=Thu
X=MO

so Y/X=3/1

answer:A

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dtweah: Master | Next Rank: 500 Posts; Posts: 487; Joined: Fri Mar 27, 2009 5:49 am; Thanked: 36 times

Re: On a certain assembly

by dtweah » Mon May 25, 2009 5:36 am

figs wrote:On a certain assembly line, the rejection rate for Monday’s production was 4 per cent, for Tuesday’s 8 per cent, and for the two days combined 7 per cent. What was the ratio of Tuesday’s production to Monday’s production?

A. 3/1

B. 2/1

C. 1/1

D. 1/2

E. 1/3

oa..later