The johnson twins were born twelve years after their older sister. this year, the product of the three siblings' ages is exactly 1663 more than the sum of their ages. how old are the twins?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Negative 5 1/12 + negative 4 1/4 + 6 3/4

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.