Question

X can do a work in 10 days and y in 20 days. if they work on it together for 4 days, then the fraction of the work that is left is

Answer 1

One day work of x=1/10
One day work of y=1/20
Together (A+B)One day work
$\frac{1}{10} + \frac{1}{20} = \frac{3}{20}$
Now,
They work for four days
$\frac{3}{20} \times 4 = \frac{3}{5}$
Remain work=
$1 - \frac{3}{5} = \frac{2}{5}$

Answer 2

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