19. which of the following is not a step in the problem-solving procedure? a. read the problem carefully. b. check your work. c. decide which operations to use. d. use trial and error to find an answer.

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?