A cup of cereal has 12 grams of fiber,which is 40% of the recommended amount.

Answer 1

the answer is 30
Because 15 is 50 percent of 30
30 divided by 100 is 0.3
0.3 times 40 equals 12

Answer 2

let the recommended amount be x g
.4x = 12
x = 12/.4 = 30 g

Answer 3

30% im in imagine math