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Time taken by boat upstream (u) = 6 hrs Time taken by boat downstream (v) = 3 hrs Speed of boat in upstream = 15 km/h Distance travelled by boat in upstream = 15 × 6 = 90 km we know that, u + v = 90/3 = 30 u – v = 15 Distance travelled by boat downstream = 7 × 30 = 210 km
Find the largest three-digit number that leaves '3', '4' and '5' as remainder when it is divided by '7', '8' and '9', respectively.
Indicate the numbers that are divisible by both 2 and 3.
When N is divisible by 5 the remainder is 2. What is the remainder, when n³ is divided by 5?
Find the remainder when the number (289n + 147) is divided by 17.
4096 2048 514 64 4
...What is the smallest number that needs to be added to 978 to make it a multiple of 37?
Find the number of zeros at the end of 78!.
