Find the total amount. Set up a proportion:
2/5/14 = 1/x
Cross multiply:
2/5x = 14
Divide 2/5 to both sides or multiply by its reciprocal, 5/2:
x = 14 * 5/2
x = 70/2
x = 35
So the total amount of muffins is 35.
Now subtract this from the one's that blew away to find out how many are left.
35 - 14 = 21
So there are 21 muffins left.