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Maths Puzzle
Numerical Ability
if Jane takes 5 hours to paint a house and John takes 6 hours to paint a house. How long will it take them working together?
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book Other Question
simplify the expression
-4(5c+7)-3c+13
how much water must be evaporated from 32 ounces of a 4% salt solution to produce a 6% salt solution?