book Maths Puzzle Numerical Ability

how many pints of a 40% salt solution must be added to 12 pint of a 20% salt solution to end up with a 32% salt sollution

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How do you find the slope of a line? You have borrowed $130,000 to buy a new motor home. Your loan is to be repaid over 15 years at 8% compounded monthly If you pay an extra $200 per month on the motor home,
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