if 8 men or 12 women can do a piece of work in 15 days , in how many days can the same work be done by 6 men and 11 women ?
"8 men = 12 women ( i . e 2 men = 3 women ) 12 women 1 day work = 1 / 15 soln : 6 men ( 9 women ) + 11 women = 20 women = ? 1 women 1 day work = 12 * 15 = 1 / 180 so , 20 women work = 20 / 180 = 1 / 9 ans : 9 days answer : a"
inverse(add(divide(6, multiply(8, 15)), divide(11, multiply(12, 15))))