book Maths Puzzle Numerical Ability

Are there key factors to observe when solving word problems?

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book Other Question

If Sally can paint a house in 4 hours and John can paint the house in 6 hours. How long will it take them to paint the house together?
I am new at Algebra i havent have PRe-algerbra they just move me and i am so nervous because i dont know anything about that can u help me.PLEASE.
THANKS!!!