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Solution


Q.

A road roller, often called a roller compactor or just a roller, is an engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of roads and foundations. Similar machines are also used in landfills or agriculture. Past records of a road roller manufacturing company show that the number of products produced forms an arithmetic progression (AP).
The company produced 270 road rollers in the 4th year and 510 in the 10th year.

Based on the above information, answer the following questions

 

(ii) What was the company’s production in the 8th year
1 430  
2 420  
3 415  
4 410  

Ans.

(1)

Company’s production in 8th year is given by:

a8=a+7d=150+7×40=150+280=430