(a) Correct statement of equation: 1 Mark each
(b) Framing of equation: 1 Mark
     Solution: 1 Mark
(a) i) When a number is multiplied with 7 and 4 is added to their product, we get 46 as the final result.
     ii) When a number is multiplied with 5, 4 is added to their product and their final sum is divided by 6, the result which we get is 13.
(b) Let Raju's age be x.
     Raju's father's age = $3x+5=44$
     $\Rightarrow 3x+5=44$
     $\Rightarrow 3x=44-5=39$
     $\Rightarrow x=\frac{39}{3}$
     $\Rightarrow x=13years$
Raju's age is 13 years.