Sandy charges each family that she babysits a flat fee of 10$ for the night and an extra 5$ per child kimmi charges 25$ per night no matter how many children a family has

a. write a two step eqaution that would compare what the two girls charge and find when their fees are the same

b. how many children must a family have for sandy and kimmi to charge the same amount

c. the sanderson family has five children which babysitter should theychoose if they wish to save some money on babysitting and why