Given that
The total cherries are 24 and Ross ate 9 cherries.
Explanation -
Let the cherries bought by Janet and Ross be J and R respectively.
Then,
J + R = 24
and Ross ate 9 of them.
So,
J + 9 = 24
J = 24 - 9
So the correct option is A
The final answer is J = 24 - 9