At the beginning of a month ,a factory has enough materials to make 240 tonnes of steel in a month.If 60 more tonnes of steel is to be made that month.how long will the materilas last?

A person earned 12000 rupees last month and it is 6 % more this month. How much is this month's earning?

There has been a considerabfe drop in sales of four wheelers during the past six months when compared to the number of four wheelers sold during this period last year. Which of the following can the probable cause of the above phenomenon? (A) The govt. has imposed higher excise duty on four wheelers at the beginning of this year. (B) The petrol prices have risen considerably during the past eight months. (C) The rate of interest on home and car loans have been rising for the past seven months.

There has been a considerable drop in sales of four wheelers during the past six months when compared to the number of four wheeler sold during this period last year. Which of the following can the probable cause of the above phenomenon? (A) The govt. Has imposed higher excise duty on four wheelers at the beginning of this year. (B) The petrol prices have risen considerably during the past eight months. (C) The rate of interest on home and car loans have been rising for the past seven months. (a) All (A), (B) and (C ) (b) (A) and (C ) Only (c) (B) and (C ) Only (d) (B) Only

Suppose that a mothball loses volume by evaporation at a rate proportional to its instantaneous area.If the diameter of the ball decreases from 2cm to 1cm in 3 months,how long will it take until the ball has practically gone?