The H.C.F. of two numbers is 8. Which one of the following can never be their L.C.M? 

If $$ {t^{2}-4t+1=0}$$ then what is the value of $${t^{3}+{1\over {t^{3}}}}$$ ?

The largest 4 - digit number exactly divisible by each of 12, 15, 18 and 27 is : 

An amount doubles itself in 5 years with simple interest. What is the rate of interest per year?

A man can swim at the rate of 3 km/hr. in still water. Then, if speed of the stream is 2 km/hr., then in what time he will cover a total distance of 5 km in with the stream and against the stream?

By selling an article for Rs. 700 a man lost 30 %. At what price should he have sold it to gain 30%? 

How many times the keys of a typewriter have to be pressed in order to write number from 121 to 1346?

The simple interest for four years is one fourth of the principal. At the same rate, which amount become Rs.450 total amount in 2 years?