Study the following information carefully and answer the questions given below:
There are six persons of different weights. Three persons are heavier than Rohan. Two person’s weight is in between Sohan and Geeta. Rajesh is heavier than Rakesh but lighter than Ram. Neither Rakesh nor Geeta is lightest person. Weight of 2nd heaviest person is 66kg. Weight of all persons are in whole numbers. What is the weight of Sohan?

In the following question, two signs and two numbers need to be interchanged to make it correct. Select the appropriate signs and number from the given alternatives.
6 × 8 + 2 = 20

Some equations have been solved on the basis of a particular system. On the same basis, find the correct answer to the equation.
1 × 3 × 5= 531
2 × 7 ×9 =972
4 × 6 × 8=?

6 years ago, Raju's age was 2 years less than half of his brother's age, which was 20 years. What is his present age?

If 16 Δ 4= 64 and 216 @ 8=27 and what is the value of 8 Δ 5@ 4 =?

If ‘P’ means ‘÷’ and ‘Q’ means ‘+’ and ‘R’ means ‘×’ then Find the value of 16 P 8 Q 9 R 12?

If you write down all the numbers from 1 to 99, then how many times do you write 3?

If '+' becomes '-' and '×' becomes '÷', find the value of ((175 + 160) × 50) × 10.