book Maths Puzzle Numerical Ability

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

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book Other Question

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. sole the following word problem by using the system linear equation in two variables:

one number is 3 more than the second number. twice the first is 9 less than 3 times the second