Explanation:
Let's change the denominator of
to 15 as it is the lowest common multiple of both denominators, 5 and 3.
Now, think of it this way, there are 15 people cycling and
of them cycle to work.
Out of these 15 cyclists, 3 of them go to work. As
of these remainders cycle via mountain bikes, we can find how many people ride mountain bikes to work.
As there was a total of 15 people at the start and 2 who rode mountain bikes to work, the fraction of the population who rides mountain bikes to work will be
Short answer:
