exam
Maths Puzzle
Numerical Ability
x^+x-2=0
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exam Other Question
#1) (2x-3) (4x+5)=0
#2) X to the second power -3x=0
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One pipe alone will fill a tank in 7 1/2 hrs. A second pipe will fill it alone in 10 hrs. I the second pipe were open for 8 hrs. and then closed, how long would the first pipe take to finish filling the tank?