the average age of 7 men increases by 4 years when two women are included in place of two men of ages 26 and 30 years . find the average age of the women ?
"explanation : 26 + 30 + 7 * 4 = 84 / 2 = 42 answer : a"
divide(add(add(26, 30), multiply(7, 4)), const_2)