Janu drank $10$ glasses of water every day. She used to drink water for $7$ days regularly. How many glasses of water did she drink in the total $7$ days?

Given:
Number of glasses of water $=$$10$
Number of days $=$$7$
To Find:
The total number of glasses of water in $7$ days
Solution:
Number of glasses of water $=$$10$
Number of days $=$$7$
Total number of glasses of water $=$$10\times 7$$=70$

Therefore, the correct option is A.