Solution:

Mass of large block = M = 5 kg
        Mass of large block = m = 3 kg
        Tension produced in each string = $T_{1} =  ?  and  T_{2}$ = ?
        
            $T_{1}$ = $w_{1} + w_{2}$ 
            $T_{1}$ = Mg + mg
            $T_{1}$ = (M + m)g
            $T_{1}$ = $(3+5) \times 10$
                = $8 \times 10$
                = 80 N
                
        Also, $T_{2}$ = mg
            $T_{2} = 3 \times10$ = 30 N