instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Armaments manufacturers use lithium to produce tritium in _ ways.
answer:
two


question:
Infertility affects one in _ couples and affects both men and women.
answer:
seven


question:
Acrobats mount a single bicycle until _ people in all are stacked on top of it.
answer:

ten