in a certain school , the ratio of boys to girls is 5 to 17 . if there are 72 more girls than boys , how many boys are there ?
"the ratio of b to g is 5 : 13 and the other data point is g are more than boys by 72 . . . looking at the ratio we can say that the 12 ( 17 - 5 ) extra parts caused this diff of 72 . so 1 part corresponds to 72 / 8 = 9 and so 5 parts correspond to 12 * 9 = 108 . e"
subtract(divide(72, subtract(const_1, divide(5, 17))), 72)