Question

if the ratio of tourists to locals is 2:5 and there are 50 tourists at the opening of a new museum how many locals are in attendance

Answer 1

Ratio: 2 tourist: 5 locals

To find the number of locals you multiply the given number of tourits by 5/2:

$50\text{tourist}\cdot\frac{5\text{locals}}{2\text{touritst}}=125\text{locals}$Then, when there are 50 tourist, there are 125 locals