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Downstream speed = 56/7 = 8 km/hr Upstream speed = 56/14 = 4 km/hr So speed of boat in still water = (8 + 4)/2 = 6 km/hr
The sum of two numbers is 18 while the sum of their squares is 164. Find the sum of the cubes of those two numbers.
Find the number of zeros at the end of 78!.
The raw material cost of an article is 1/3 of its manufacture cost. If the cost of manufacturing is decreased in the ratio of 4 : 3 and the cost of it...
The number of present boys to girls is in the ratio 2:1. If 15 girls are absent and they form 25% of the total class, and no boy is absent, then find th...
Which of the following pairs of numbers are co-primes?
The cost of 2 mouse and 3 keyboard is Rs.150 and that of 3 mouse and 2 keyboard is Rs.120. Find the cost of 5 mouse and 2 keyboard?
