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Prof. Tembel told his class that the method of student evaluation of teachers is not valid measure of teaching quality. Students should fill out questionnaires at the end of the semester when courses have been completed. Which of the following, if true, provides support for Prof. Tembel`s proposal

In making a camera the costs of labor and material are in the ratio of 3: 2. The manufacturer sells the camera for Rs.800 making a profit of 20. What is the cost of labor in the camera

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50 copies of a book can be purchased for a sum payable 3 months hence while 51 copies can be had for same sum for cash payment. What is the rate of interest per year

A plane flies from Mumbai to Delhi at 600 kms per hour and returns along the same route at 400 kms per hour. What is the average (Arithmetic mean) flying speed for the entire route