TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Autism is _ to four times more likely to affect boys than girls.

SOLUTION: three

PROBLEM: Weasels reaching _ to six years are regarded as fully mature.

SOLUTION: five

PROBLEM: Massive stars explodes after only a few _ million years as enormously energetic supernovae.

SOLUTION:
ten