If 15 men can prepare 12 toys working 5 h per day in 16 days, then in how many days can 10 men prepare 15 toys working 8 h per day?

Using formula M₁D₁T₁W₁ = M₂D₂T₂W₂
M₁ = 15, M₂ = 10, D₁ = 16, D₂ = ?
T₁ = 5, T₂ = 8, W₁ = 15, W₂ = 12
Now, 15 x 16 x 5 x 15 = 10 x D₂ x 8 x 12
D₂ = (15 x 16 x 5 x 15)/(10 x 8 x 12)
= (15 x 15)/12 = 75/4 = 18³/₄ days