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: Scientists use a characteristic to classify animals into _ groups.

SOLUTION: two

PROBLEM: Algae come in _ forms, unicellular, multicellular and colonial.

SOLUTION:
three