i m working
we have given that 4 hours practice for 3 days in week.
we know that for six weeks we have 26 weeks.
we need to find hours did he practised in 6 months.
for one month we are having 4.35 weeks.
for six months the weeks will be

for one week he is practising 4 hours per day.
per week he is practised for 3 days.
so the number of hours practised for on week is

the number of hours practised for 26.04 weeks

he practised for about 312.48 hours in 6 months.