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mogaka and Onduso working together can do a piece of work in six days.mogaka , working alone takes five days longer than Onduso. How many days does it take Onduso to work alone?

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Let Onduso take x days
⇒ Mogaka takes x + 5 days 
+   1    =
    x    x + 5    6
6(x+5) + 6x = x(x+5)
x2 - 7x - 30 = 0
(x -  10)( x + 3)
x = 10, - 3
∴ Onduso takes 7 days

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