1. I would first write it out as fraction
2/1 divided by 2/5
2. When dividing fractions you need to find the reciprocal (opposite of or switched) of the fraction then multiply the two fractions together
2/1 divided by 5/2 <------- that's the reciprocal of 2/5
3. Now multiply
2 5 10
- x - = - = 5
4. 5 is your answer! :)
1 2 2