I gave 50 points solve the question 4
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The answer to question 42 is 4 because you multiply pi by the square root of pi
Work done by x in 1 - day = (1/25).
Work done by y in 1 - day = (1/20).
Work done by (x + y) in 1 day = (1/25 + 1/20)
= (4 + 5)/100
= (9/100).
Work done by them in 5 days = (9/100) * 5
= 9/20.
Remaining work = 1 - (9/20)
= 11/20.
Now,
x can complete the remaining work :
= > (11/20)/(1/25)
= > (11/20) * (25/1)
= > (11 * 25/20)
= > (275/20)
= > 13.75.
Hope it helps!