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ATQ, Let the usual speed be 10x km/h. The reduced speed = (9/10) × 10x = 9x km/h Using the formula Distance = Speed × Time, 
Usual speed = 10x = 50 km/h.
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!.
