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I am getting "B"
12 days 6 machine
1 machine = 72 days
8 days = 72/8 = 9 machine
delta = 3 machine
rate
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amitabhprasad
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Remember that in questions like this you can add the rates, so in the first case, quantity/6r=12 and in the second case, quantity/xr=8. Accordingly x=9, and so the additional number of machines=3.
amitabhprasad wrote:I am getting "B"
12 days 6 machine
1 machine = 72 days
8 days = 72/8 = 9 machine
delta = 3 machine
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parallel_chase
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Here is a simple way to remember things
work = rate * time * no. of machines
let work be 1
1 = rate * 12 * 6
rate = 1/72
everything remains the same except for no. of machines
work = rate * time * no. of machines
1 = 1/72 * 8 * no. of machines
no. of machines = 72/8 = 9
additional machines required = 9-6 = 3
Hope this helps.
work = rate * time * no. of machines
let work be 1
1 = rate * 12 * 6
rate = 1/72
everything remains the same except for no. of machines
work = rate * time * no. of machines
1 = 1/72 * 8 * no. of machines
no. of machines = 72/8 = 9
additional machines required = 9-6 = 3
Hope this helps.
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