Answer:
100 42/100
Step-by-step explanation: you put the change as a fraction
Ok. In order to do this set up 2/5 divided by 5/7. The way you divide with fractions is by multiplying them but flipping the second fraction into 7/5 <---this is known as the reciprocal. In other words do:
2/5 x 7/5 =
14/25
There you go.
You have a 16.7% chance of rolling doubles