(3) 16 men + 12 women complete the work in 8 days. 20 men complete the work in 16 days. ⇒ 16 × 8 men + 12 × 8 women = 20 × 16 men ⇒128 men + 96 women = 320men ⇒96 women ⇒ 192 men ⇒ 1 woman = 2 men ⇒16 women = 32 men ⇒M1D1=M2D2 ⇒20 × 16 = 32 ×D2 ⇒D2 =