Question

20% of what is 9? Jonas answered this question as shown. Explain his error and provide the correct solution

Answer 1

Let the unknown be x
20% of x = 9
Solve for x

Answer 2

20% of x = 9 ("of " means multiply)
.20x = 9
.20x/.20 = 9/.20
x = 45

check...
(.20)(45) = 9

Jonas made the mistake of making 20% be equal to .02. When, in fact, 20% = .20.

Answer 3

oops...I didn't finish checking...
(.20)(45) = 9
9 = 9 (correct)