The average salary, per head, of all the workers of an institution is 60. The average salary of 12 officers is 400; the average salary, per head, of the rest is 56. The total number of workers in the institution is -
459 0 6540d96727398ecb26d3914aA man purchased 7 bags of rice at the rate of ₹ 800 each, 8 bags of rice at ₹ 1000 each and 5 bags of rice at the rate of ₹ 1200 each. What is the average cost of one bag of rice?
408 0 6540cd7dc298bbcb0284a093The average of 30 numbers is 40 and that of the other 40 numbers is 30. The average of all the numbers is-
380 0 6540b7da27398ecb26d33cc9Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is
396 0 653f829edfda58cb3c93bbb2