the average age of 7 men increases by 3 years when two women are included in place of two men of ages 18 and 22 years . find the average age of the women ?
"explanation : 18 + 22 + 7 * 3 = 61 / 2 = 30.5 answer : a"
divide(add(add(18, 22), multiply(7, 3)), const_2)