book Maths Puzzle Numerical Ability

2ab^2-3ab when a=1 and b=-3 how do you solve this problem

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book Other Question

a) Find the simple interests on a $16700 loan at an annual rate of 12,5% for two years.

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the sum of the digits of a two digit number is 12. the number is 13 times the tens digit. find the number.
thanks for the help!