What least number must be added to 6834 to get a number exactly divisible by 18?

When we divide 6834 by 18 we get remainder = 12 ∴ Required number = 18 – 12 = 6

- Raj scored 140 marks in a test getting 3 marks for each right answer and losing 1 mark for each wrong answer, had 4 marks been awarded for each correct answer and 2 marks been deducted for each incorrect answer, then Raj would have scored 170 marks. How many question were there in the test?
- Least number which when subtracted from 5442 gives a perfect square is:
- The sum of three consecutive odd natural numbers each divisible by 3 is 81. Which number is the largest number among the three numbers?
- One baker house has to make 600 cakes and another one 750 cakes during the same period of time. In the first house, the order was ready 5 days ahead of time and in the second house, 10 days ahead of time. How many cakes did second baker house make a day if the second baker house made 20 cakes more a day than the first?
- The numerator of a fraction is 9 less than its denominator. If the numerator is decreased by 4 and the denominator is increased by 2, then the denominator is 16 times the numerator. Find the fraction
- In a test comprising 200 questions, four marks are awarded for every question answered correctly. The number of marks deducted for every question answered wrongly and for question left unattempted is 2 and 1 respectively. If a student got 80 marks in the test, then which of the following can be the number of questions solved wrongly by the students?
- There is a fraction whose denominator is 5 more than its numerator. If the numerator is increased by 10 and denominator is decreased by 4, the fraction will have its value 2. What is the fraction?
- Let p be a prime number. Then √p is:
- There are 3 natural numbers. If the average of any 2 numbers is added with the third number 34, 30 and 28 will be obtained. Find the numbers.
- A waiter income consist of his salary and tips. During one week his tips were 4/5 of his salary. What portion of his income came from tips?

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