$$ {({1\over25})^{-1\over2}}+{({8\over 27})^{-1\over3}}$$

Find the average of the following set of numbers.
132, 148, 164, 128, 120, 136

Rajesh goes to his office at the speed of 25km/hr and return to his home at the speed of 20 km/hr. If he takes total 9 hours, then what is the distance between his office and home?

The average of 19 numbers is 24. If each number is multiplied by 3, what is the new average?

What is the difference between the interest of Ram and Shyam in the given picture if Ram's money is on simple interest and Shyam's money is on compound interest.

The average weight of 10 parcels is 1.7 kg. The average weight is reduced by 60 grams when a new parcel is added. How much is the weight of the new parcel?

Reflection of the point (-1, 4) in the x-axis is: 

In an election 20% of the voters did not vote and 120 votes were invalid. Winner got 200 votes more than this opponent and secured 41% votes of the total number of votes. What percentage of the votes defeated candidate got out of the total votes cast?