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Maths Puzzle
Numerical Ability
Three times a number, decreased by 8 is the same as twice the number, increased by 15?Find the number.
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book Other Question
If pump A can empty the pool in 20 mins, and pump B can empty it in 30 mins, how long does it take if both pumps are used?
Find all positive values for k for which the following can be factored.
x^2 + x - k
Thank you!