Multiplying (2) by 2 and subtracting (2) from the equation so obtained,
we get

(-)      (-)    (-)

    \ y = 60

Substituting y = 60 in (2) we get

Therefore, 1 man takes 15 days and 1 child takes 60 days.

Example Julie can paint an apartment in 10 hours and Jackie can paint it in 12 hours. How long would it take for the two of them working together to paint the apartment?

Solution :

\ 11 x = 60

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Index

9.1 - Definition and Solving Techniques
9.2 - Use of Simultaneous Linear Equations

Chapter 1