Answer: He used
of a meter for each mask.
Explanation:
Given : A tailor used 2 meters of string to make 10 Halloween masks.
Here, Total length of string = 2 meters
Number of masks = 10
The the part of a meter of string is used for each Halloween mask will be :-
[Divide total length of string by number of masks]
Hence, he used
of a meter for each mask.