exam Maths Puzzle Numerical Ability

Using a new lawn mower, Abby can mow the lawn in 2 hours. Her sister Carla uses an older mower and takes 3 huors to mow the same lawn. How long will it take them if they work together? Please tell me how you answer it. That would be awesome.

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exam Other Question

simplify

5xy - 3y
---------
9 - 15x
6a + 3+ 2a = 11