The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then…

The average income of A, B and C is Rs. 12,000 per month and average income of B, C and D is Rs. 15,000 per month. If th…

A man had 7 children. When their average age was 12 years, a child aged 6 years died. Then average age of remaining six …

The mean of 9 observation is 16. One more observation is included and the new mean becomes 17. The 10<sup>th</s…

Mean of 10 numbers is 30. Later on it was observed that numbers 15, 23 are wrongly taken as 51, 32. The correct mean is …

The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5&de…

The average of runs of a cricket player of 10 innings was 32. How many runes must be made in his next innings so as to i…

The average (arithmetic mean) of 3<sup>30</sup>, 3<sup>60</sup> and 3<sup>90</sup> i…