exam Maths Puzzle Numerical Ability

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?

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x^+x-2=0 Please help me solve this: How many pounds of tea worth $1.50 per pound should be mixed with tea worhth $1.70 per pound to make 40 pounds of blended teas to sell at $1.55 per pound? Thank you