Answer:
the greatest number that Sara can think off is 704 to get 700 as round off.
Explanation:
Sara on rounding off a number gets 700
she might be thinking of number 695 or 704
hence, the greatest number that Sara can think off is 704 to get 700 as round off.
when rounding off any number if the adjacent number is less than 5 then the number will not be increased by 1, like in case of 704
But when the number will be less than 5 or equal to 5 then it will the number will be added by 1, like in the case of 695.