Answer: He used \(\dfrac{1}{5}\) of a meter for each mask.
Step-by-step 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 :-
\(\dfrac{2}{10}=\dfrac{1}{5} \text{ meter}\) [Divide total length of string by number of masks]
Hence, he used \(\dfrac{1}{5}\) of a meter for each mask.
