A grocery clerk put only packages of flour tortillas and packages of corn tortillas on a shelf. The ratio of the number of flour tortillas to the number of packages on the shelf was 5 to 9. Which number could be the number of packages of corn tortillas the clerk put on the shelf?

Question

Responses
A 3232
B 2323
C 1818
D 14

Answer 1

Since the ratio of flour tortillas to total packages is 5:9, the ratio of corn tortillas to total packages must be 4:9. Therefore, the number of packages of corn tortillas must be a multiple of 4 that is also divisible by 9. The only option that fits this criteria is 18, so the answer is (C) 1818.