instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Telescopes come in _ basic types - refractors and reflectors.
answer:
two


question:
Women devote their lives to raising families of six, seven and _ children.
answer:
eight


question:
Fitnesses are important numbers in evolutionary theory and can be estimated by _ main methods.
answer:

three