We are given: \[ \text{Amal : Sunil} = 3 : 2 \quad \text{(i)} \] \[ \text{Sunil : Mita} = 4 : 5 \quad \text{(ii)} \] To combine them, make Sunil’s parts equal in both ratios. LCM of 2 and 4 is 4. So rewrite the ratios: \[ \text{Amal : Sunil} = 6 : 4 \quad \text{(multiply both terms by 2)} \] \[ \text{Sunil : Mita} = 4 : 5 \] Now combine: \[ \text{Amal : Sunil : Mita} = 6 : 4 : 5 \]
Mita’s share = ₹400 So the share units are: \[ \text{Total parts} = 6 + 4 + 5 = 15 \] Each part = \[ \frac{400}{5} = 80 \] So Sunil’s share (4 parts) is: \[ 4 \times 80 = \boxed{₹320} \]
Sunil’s share is ₹320
For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: