A bond gets matured in 10 years . invested TK. 42,000 in this bond and received Tk. 105000 once the bond matured . If the bond was under simple interest . then what was the rate of interest per annum?

A boy goes to school at a speed of 5 km/h and returns to the village at a speed of 4 km/hr. If he takes 4 hour...

The average height of girls in a class is 5 ft and that of boys is 5.7 ft. If the average height of the studen...

The value of "A" varies in inverse proportion as the square of "B". If the value of "A" is equal to 40 , when...

The average age of the 20 aspirants of a class is 19.2 years. After some time two more aspirants join them and...

A cistern is normally filled with eater in 10 hours but takes 5 hours longer to fill because of a leak in its...

P and Q start a hotel . P left after 6 months. After the year ends, P gets Tk. 6000 as profit out of total pro...