a jar of 312 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 ?
"312 = 24 * 13 = 26 * 12 there are 24 people in the group today . the answer is d ."
divide(subtract(sqrt(add(multiply(multiply(312, 2), const_4), power(2, 2))), 2), 2)