If the sum of the digits of any integer between 100 and 1000 is subtracted from

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Question
If the sum of the digits of any integer between 100 and 1000 is subtracted from the same integer , the resulting number is always divisibleby
Options
A. 2
B. 5
C. 6
D. 9

Correct Answer

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6. If a sum of money deposited in a bank at simple interest is doubled in 6 years, then after 12 years, the amount will be
Options
A. 5/2times the original amount
B. 3times the original amount
C. 7/2times the original amount
D. 4times the original amount

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7. The number whose square is equal to the difference of the squares of 37 and 23 is:-
Options
A. 45.09
B. 28.98
C. 47.09
D. 28

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8. If a--b = 4 and ab = 45, find the value of a3 - b3
Options
A. 604
B. 370
C. 253
D. 199

Discuss

Correct Answer: 604

Explanation:

${(a ? b)}^{2} = a^{2} + b^{2} - 2 ab ? 16 = a^{2} + b^{2} ? 90 ? a^{2} + b^{2} = 106 a^{3} ? b^{3} = (a ? b) (a^{2} + b^{2} + ab) ? a^{3} ? b^{3} = 4 X (106 + 45) ? a^{3} ? b^{3} = 4 X 151 ? a^{3} ? b^{3} = 604$

9. If a/(a+b) = 15/21, what is (a+b)/(a-b) is equal to?
Options
A. 13/9
B. 23/11
C. 14/5
D. 21/9

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If the sum of the digits of any integer between 100 and 1000 is subtracted from the same integer , the resulting number is always divisibleby

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If the sum of the digits of any integer between 100 and 1000 is subtracted from the same integer , the resulting number is always divisibleby

Simplification problems

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