exam Maths Puzzle Numerical Ability

n q
2 11
4 17
5 23
8 29
10 35
Whats is the rule of this algebraic expression?

Which one of these senetences best describes this rule.
Q=(3+N)*5 Q=3*(N+5) Q=3N+5

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exam Other Question

If a sum of 12000 doubles in 5 years at compound interest basis.Then what will be the amount after 20 years, if compounded annually? Hi I need help I have no Idea how to solve these problems or what steps to take it seems easy but I dont know what Im doing please help me.

An example of a queshtion is Find thee consecutive odd integers whose sum is 117.
Thanks Dominik