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811.A car travels the first 60 km of its journey at an average speed of 40 km/h. It then travels the next 60 km at an average speed of 60 km/h. Find its average speed for the entire 120 km journey?
812.If the product of 4, 5, and q is equal to the product of 5, p, and 2, and pq ≠ 0, what is the value of the quotient p/q?
813.Find the fourth proportion of 5, 8, 10?
814.The circumference of circle C is 18π. The diameter of the circle C is?
815.The average of six consecutive even numbers is 35. The largest number is?
816.Find the average of 4, 8, 12, 16, 20?
817.LCM of 18 and 24 is?
818.Find the remainder when 845 is divided by 7?
819.Simplify: 3/4 + 1/8?
820.If the number is increased by 25%, the result is 250. The original number is?