how decimal addition can be solved

Aldol addition can be

There asre 5 questiions in a question paper. In how many ways can a boy solve one or more questions?

7 men can complete a plece of work in 12 days. How many additional men will be required to complete double the work in 8 days ?

60+6+ ( 4)/( 10) + ( 8 )/(100) in decimal form can be written as

Operations on decimal fractions: addition: subtraction: multiplication and division

How many of the following addition reactions are syn addition reaction?

Can you think and answer how a reporter enzymes can be used to monitor tranformation of host cells by foreign DNA in addition to a selectable marker ?