Q.126- The average of the reciprocals of x and y is.
Q.127- The arithmetic mean of 15 numbers is 41.4. Then the sum of these numbers is.
Q.128- If the average of m numbers is $${n^2}$$ and that of n numbers is $${m^2}$$, then the average of (m + n) numbers is.
Q.129- Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of the numbers is $$\frac{7}{72}$$ . The numbers are:
Q.130- There are 4 consecutive odd numbers (x1, x2, x3 and x4) and three consecutive even numbers (y1, y2 and y3). The average of the odd numbers is 6 less than the average of the even numbers. If the sum of the three even numbers is 16 less than the sum of the four odd numbers, what is the average of x1, x2, x3 and x4?