Given, M1 = 20
M2 = 25
T1 = 5
D1 = 10 and D2 = ?
According to the formula, M1T1D1 = M2T2D2
= > 20 x 5 x 10 = 25 x 10 x D2
D2 =\( \Large\frac{ 20 \times 5 \times 10}{25 \times 10} \)= 4 days