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 class there are 32 boys and 28 girls. The average age of the boys in the class is 14 years and the average age of t…

Average of ten positive numbers is $$\overline x $$. If each number is increased by 10%, then $$\overline x $$ -

The average weight of three boys A, B and C is $$\frac{{163}}{3}$$ kg, while the average weight of three boys B, D and E…

The average salary of all the workers in a workshop is Rs. 8,000. The average salary of 7 technicians is Rs. 12,000 and …

The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations is 20. The mean of a…

From a class of 42 boys, a boy aged 10 years goes away and in his place, a new boy is admitted. If on account of this ch…

An elevator can carry maximum of 16 passengers with an average weight of 80 kg. However, four boys more than the maximum…