When we reverse the digits of the number 13, the increases by 18. How many other two digit numbers increases by 18 when their digits are reversed?
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The sum of four consecutive two-digit odd numbers, when divided by 10, become a perfect square. Which of the following can possibly be one of these four numbers?
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Consider four digit numbers for which the first two digits are equal and the last two digits are also equal. How many such numbers are perfect squares?
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In a 4-digit number, the sum of the first two digits is equal to that of last two digits. The sum of the first and last digits is equal to third digit. Finally, the sum of the second and fourth digits is twice the sum of the other two digits. What is the third digit of the number?
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Two alarm clocks ring their alarms at regular intervals of 50 seconds and 48 seconds. If they first beep together at 12 noon, at what time will they beep again for first time?
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On a road three consecutive traffic lights change after 36, 42 and 72 seconds respectively. If the lights are first switched on at 9:00 AM sharp, at what time will they change simultaneously?
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The HCF of 2472, 1284 and a third number 'N' is 12. If their LCM is 23 × 32 × 5 × 103 × 107, then the number 'N' is:
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Find the LCM and HCF of 2.5, 0.5 and 0.175.
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Find the HCF of (3125-1) and (335-1).
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The last digit of the number obtained by multiplying the numbers 81 × 82 × 83 × 84 × 86 × 87 × 88 × 89 will be
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The sum of the digits of two-digit number is 10, while when the digits are reversed, the number decrease by 54. Find the changed number.
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If A381 is divisible by 11, find the value of the smallest natural number A?
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If 381A is divisible by 9, find the value of the smallest natural number A?
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A forester wants to plant 44 apples tree, 66 banana trees and 110 mango trees in equal rows (in terms of number of trees). Also, he wants to make distinct rows of tree (i.e. only one type of tree in one row). The number of rows (minimum) that required is:
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The greatest number which will divides: 4003, 4126 and 4249, leaving the same remainder in each case:
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Find the number of divisors of 1420.
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The LCM of two numbers is 1890 and their HCF is 30. If one of them is 270, the other will be
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Find the least number of five digits which when divided by 40, 60, and 75, leave remainders 31, 51 and 66 respectively.
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There are 576 boys and 448 girls in a school that are to be divided into equal sections of either boys or girls alone. Find the total number of sections thus formed?
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Which of following can never be ending of a perfect square?
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