Gopal and Ravi contracted a work for Rs 480. If Gopal can do that work in 15 days and Ravi can complete that same work in 10 days. He completed this work with Mahesh in 5 days, then tell me how much money Mahesh got.

A bank offers 15 % compound interest per half-year. A customer deposits Rs 2400 each on 1 January and 1st July of a year. At the end of the year, the amount he would have gained by way of interest is –

A man can row with the stream at 9 km/hr. and against the stream at 3 km/hr. His speed in still water is -

If $$ {x+3y-{2z\over 4}}=6$$ , $$ {x+{2\over 3}}(2y+3z)=33$$ and $$ {1\over 7}{(x+y+z)+2z=9}$$, then what is the value of $$ {46x+131y}$$?

The average weight of 14 children is 22 kg. If the weight of the teacher is also included, then the average weight becomes 23 kg. What is the teacher's weight?

In a 1500 m race, Chaitali beats Vrunali by 100 m and in 1200 m race, Vrunali beats Krutika by 75 m. If Chaitali and Krutika are compared, then for how much m Chaitali will beat Krutika in 900 m race?

A wheel travels a distance of 22 km in 2500 revolutions. What is the diameter of the wheel?