book Maths Puzzle Numerical Ability

in our class for algebra 2 we are working on probablity and also permutations and combinations.

a test contains 20 questions. the teacher asks you to answer 15 questions. How many different ways can you answer 15 questions.

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book Other Question

$65.00 was the quoted price on a yard of cement, but the actual price was $74.40 which included 6% sales tax. What was the percent of increase from the actual price and the quoted problem given by teacher from a worksheet
3 circles on the same straight line, the 1st with a radius of 16 cm, the 2nd with a radius of 9cm, is there a way to find the radius of the 3rd circle which sits in between the other two?
thank you