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Answer:
20/7
Step-by-step explanation:
Let the total work be x,
Work Done by A: X * 1/4 = x/4
Work Done by B: X * 2/5 = 2x/5
Work Done by C: X - (A + B)
Total Work Done by A and B = 2x/5 + x/4
Lcm of 4 and 5 = 20
{(2x /5) x 4/4} + {(x/4) x 5/5)}
8x/20 + 5x/20
Work done by A and B together= (8x + 5x)/20
Work done by C = {X - (13x/20)}
= (X/1) x (20/20) - 13x/20
(20x-13x)/20
Work Done by C = 7x/20
If we remove X, Work done by C is 7/20
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Step-by-step explanation:
9/20 hope it's help you I actually doing
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