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by Suyog » Thu Dec 06, 2007 3:50 pm
1.
A + B = 6/5; Time taken, 1/(6/5) = 5/6 ........ I
B + C = 3/2; Time taken, 1/(3/2) = 2/3 ........ II
A + C = 2; Time taken = 1/2 ....................... III

Adding I, II and III

2(A + B + C) = 5/6 + 4/6 + 3/6 = 12/6 = 2
hence, A + B + C = 1

Ans E.

2.
200, 6 ounce of juice will be 1200 ounce.
To prepare the juice 1 can of concentrate and 3 cans of water is taken.
So to prepare 1200 ounces of juice 300 ounce of concentrate and 900 ounce of water will be required and we have 12 ounce cans of concentrate.

So,
300/12 = 25

Ans A.
Last edited by Suyog on Thu Dec 06, 2007 4:13 pm, edited 1 time in total.
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by xcise_science » Thu Dec 06, 2007 4:10 pm
hi,
I'm still unclear on the rate question.

Yes, the combined rate for ABC = 2, but how is the (answer) Time=1, if the total work (tank filled) = 1?

thanks
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by Suyog » Thu Dec 06, 2007 4:12 pm
Check L.H.S

A + B + B + C + A + C = 2
2( A+ B + C) = 2
So, A+ B + C = 1
Hope its clear now...
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by xcise_science » Thu Dec 06, 2007 5:49 pm
No, not really.
:?
I mean, I see the math that you're doing, but I just don't understand why.
Does that make sense?
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