In which of the following situations,does the list of numbers involved make an arithmetic progression,and why?(iii) The cost of digging a well after every metre of digging,when it cost Rs 150 for the first metre and rises by Rs 50 for each subsequent metre.

In which of the following situations,does the list of numbers involved make an arithmetic progression,and why?(i) The taxi fare after each km when the fare is Rs 15 for the first km and Rs 8 for each additional km.

In which of the following situations,does the list of numbers involved make an arithmetic progression,and why?(ii)The amount of air present in a cylinder when a vacuum pump remove 1/4 of the air remaining in the cylinder at a time .

How many cubic meters of soil shall be taken out while digging a well of depth of 22.5m and diameter 7m.?Also find the total cost of cementing the curved surface inside the well at the cost of Rs.20 per square metre.

Hasan buys two kinds of cloth materials for school uniforms, shirt material that costs him Rs 50 per metre and trouser material that costs him Rs 90 per metre. For every 2 meteres of the trousers material he buys 3 metres of the shirt materials. He sells the materials at 12% and 10% profit respectively. His total sale is Rs 36,660. How much trouser material did he buy?