Answer the following questions

There are three numbers in such a way that the average of the first and second numbers is 68 more than the average of the second and third number. Find the difference between first and the third number.

The average of x occurring 5 times and y occurring 7 times is 37. Also, the average of x occurring 7 times and y occurring 5 times is 35. The value of y is:

The average of four consecutive even numbers is 9. Find the largest number. 

Average age of mother, father and son was 42 at the time of son's marriage. After one year, an infant was born and after 6 rears of marriage the average age of family becomes 36. Find the age of bride at the time of marriage.

The average of 10 numbers is 14. If each number is multiplied by 6 then what will be the new average?

The average monthly salary of all the employees in an industry is Rs. 12,000. The average salary of male employees is Rs. 15,000 and that of female employees is Rs. 8,000. What is the ratio of male employees to female employees?

The average age of three boys is 15 years if their ages are in the ratio 3 : 5 : 7, what will be the age of the youngest boy?

The average of 10 observations is 21. A new observation is included and the average of these 11 numbers is 1 less than the prevoius average. The 11^th observation is____