A student scored marks with a certain average in the first 12 tests. In the next 6 tests, he scored with an average of 78 marks, due to which his overal...
Average weight of 50 boxes is 22 kg. Two more boxes of weights (z + 7) and (z - 5) are added and the average becomes 22.5 kg. Find (z - 18).
The average of a set of 's' numbers is 30. If 50 is added to the set, then the average of the set becomes 30.2. Find the value of '4 X (s - 5)'.
The average of five positive numbers is 56. If the first number is three-fourth of the sum of the last four numbers, then the average of the last four n...
The ratio of the present ages of P and Q is 7:4 respectively. If the age of P 13 years hence from now will be 125% more than the age of Q 4 years ago fr...
Four numbers are arranged in ascending order. When the first two numbers are increased by the number equal to their position, and the last two numbers i...
Average marks scored by each boy in a class were 90, whereas that by each girl were 100. If the number of boys is 50% more than the number of girls, the...
Average of 12 observations calculated by a student was 60 but when he again went through his observations he realised that he took value of three observ...
Average of 20 numbers is 90. Average of first 8 numbers is 92 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numbe...
The average cost price of 25 pens (having equal cost price) decreased by Rs.4, when one of the pen is replaced by a new pen having cost price of Rs.60. ...
