Malke knows that 10% of an unknown number is 12, and she wants to find that unknown number

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Can someone me out here number 4 plz