## 16. Average of 80 numbers are 42. When 5 more numbers are included, the average of 85 numbers become 45. Find the average of 5 numbers.

## 17. Find the average increase rate, if increase in the population in the first year is 30% and that in the second year is 40%.

## 18. One-fourth of certain journey is covered at the rate of 25 km/h, one-third at the rate of 30 km/h and the rest at 50 km/h. Find the average speed for the whole journey.

## 19. A batsman makes a score of 270 runs in the 87^{th} inning and thus increase his average by a certain number of runs that is a whole number. Find the possible values of the new average.

^{th}inning and thus increase his average by a certain number of runs that is a whole number. Find the possible values of the new average.

## 20. There are five boxes in cargo hold. The weight of the first box is 200 kg and the weight of the second box is 20% higher than the weight of the third box, whose weight is 25% higher than the first box's weight. The fourth box at 350 kg is 30% lighter than the fifth box. Find the difference in the average weight of the four heaviest boxes and the four lightest boxes.

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