# Frequency of a wave?

## Homework Statement

Ok so im given that a pendulum swings 41.35 seconds in 20 cycles. I have to find the frequency of that pendulum

## Homework Equations

i know that f=1/T where T is period b/c frequency and period are reciprocal to each other.
i also know that f = N/t where t is the time for i think 1 cycle? but i dont know N

## The Attempt at a Solution

Im not given Period so i have no idea how to solve for this. Please help! and please be specific on how u got your answer. Thx

## Answers and Replies

Period is the time for ONE cycle.
You are given the time for 20 cycles.
Can you find the time for one?

You know the relationship between period and frequency.