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Time & Work

A and B can d...

Question

A and B can do a work in 4 days. A alone can do that work in 20 days. Then we say that B is x% more efficient than A. Find x.

125

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150

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300

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400

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200

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Solution

The correct option is C
300

Work done by A in one day = $\frac{1}{20}$

Let the work done by B in one day = $\frac{1}{x}$

$\frac{1}{20} +$ $\frac{1}{x} =$ $\frac{1}{4}$

x = 5

So B is 300% more efficient than A.

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A and B can do a work in 4 days. A alone can do that work in 20 days. Then we say that B is x% more efficient than A. Find x.

The correct option is C 300 Work done by A in one day =120 Let the work done by B in one day = 1x 120+1x=14 x = 5 So B is 300% more efficient than A.

The correct option is C
300

Work done by A in one day = $\frac{1}{20}$

Let the work done by B in one day = $\frac{1}{x}$

$\frac{1}{20} +$ $\frac{1}{x} =$ $\frac{1}{4}$

x = 5

So B is 300% more efficient than A.