The average salary of all the workers in a workshop is Rs. 8000. The average salary of 7 technicians is Rs. 12000 and th…

Four years ago, the average age of a family of four persons was 18 years. During this period, a baby was born. Today if …

If the mean of a, b, c, is M and ab + bc + ca = 0, then the mean of a<sup>2</sup>, b<sup>2</sup>…

Of the four numbers, the first is twice the second, the second is one-third of the third and the third is 5 times the fo…

In a cricket eleven, the average age of eleven players is 28 years. Out of these, the average age of three groups of thr…

The average temperature of the town in the first four days of month was 58 degrees. The average for the second, third, f…

Nine persons went to a hotel for taking their meals. Eight of them spent Rs.12 each on their meals and the ninth spent R…

In a group of 120 people, one-fifth are men, one-fourth are women and the rest children. The average age of women is fiv…