if the digits of all 3 digit numbers are reversed then how many of the resulting numbers are
a.) less than the original number by a multiple of 9
b.) are more than original number by a multiple of 7
Solution and Technique please.
Find the number of 3 digit numbers that are divisible by 3 and end with exactly 3 zeroes when written in base 3 notation.
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How many numbers are there between 1 and 30 including both the numbers such that n! is divisible by (n+1) ?
Explanation please
A vehicle with mileage 15 km per litr contains 2 l of fuel. The vehicle gets some defect as a result of which 5 l of fuel gets wasted per hour when the engine is on . with what minimum speed the vehicle has to move to travel 20 km with the existing amount of fuel, if it travels with minimum speed options 100kmph 120kmph 150kmph 200 kmph
The concentration of solution A to that of B is in the ratio 4:5.Solution A is obtained by mixing two other solutions X and Y having same ingredients in the ratio 2:3,while solution B is obtained by mixing the solutions X and Y in the ratio 2:1.if solution x is 20percent concentrated.Find the concentration of solution B. Ans:16%
I know this is probably wrong ( as there is no optiom for it) could any one please tell me what is wrong in this approach.
15, 16 explanation please
Ans:10 litres
Solution for this question?
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Any direct formula to calculate orthocentre ?
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2nd question