a jar of 144 marbles is divided equally among a group of marble - players today . if 2 people joined the group in the future , each person would receive 1 marble less . how many people are there in the group today ?
"144 = 16 * 9 = 18 * 8 there are 16 people in the group today . the answer is c ."
divide(subtract(sqrt(add(multiply(multiply(144, 2), const_4), power(2, 2))), 2), 2)