In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Reproductive maturity occurs at seven to _ years.
[EX A]: ten

[EX Q]: Walruses walk with _ flippers over ice and snow.
[EX A]: four

[EX Q]: Watermelons produce _ types of flowers.
[EX A]:
two