Arihant Expert Team Solutions for Exercise 1: Practice Questions

The average weight of three boys P, T, R is $54\frac{1}{3} kg$, while the average weight of three boys T, F, G is $53 kg$. What is the average weight of P, T, R, F and G?

The average height of four girls was recorded as $150 cm$. If the average of the heights of three girls out of the four was $148 cm$. What was the height of the fourth girl?

The average weight of$8$ person's increases by $2.5 \mathrm{kg}$ when a new person comes in place of one of them weighing $65 \mathrm{kg}.$ What might be the weight of the new person?

What should come in place of question mark (?) in the following question?

The average weight of $21$ boys was recorded as $64 \mathrm{kg}$. If the weight of the teacher was added, the average increased by one $\mathrm{kg}$. What was the teacher's weight?

The average score of a cricketer in two matches is $27$ and in $3$ other matches is $32.$Then find the average score in all the $5$ matches?

What should come in place of question mark (?) in the following question?

The average age of $60$ boys in a class was calculated as $12$ years. It was later realised that the actual age of one of the boys in the class was $12.5$years, but it was taken as $14$ years. What is the actual average age of the boys in the class?

The average of five numbers is $34.4.$ The average of the first and the second number is $46.5$. The average of the fourth and the fifth number is $18.$What is the third number?
 

What should come in place of question mark (?) in the following question?

The average marks of $14$ students was calculated as $71$. But, it was discovered later that the marks of one student was taken as $42$ instead of $56$ and the marks of another student was wrongly taken as 74 while it was actually $32$. The correct average is?