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The sum of a certain number and its square root is 90. What is the number?

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Important Questions on Linear Equations

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What are the two numbers that differ by 4 and one-half of the greater exceeds one-sixth of the lesser by 8?
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The digit in ten's place of a two-digit number is three times that in the one's place. If the digits are reversed, the new number will be 36 less than the original number. Find the number:
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The difference between two numbers is 642. When the greater is divided by the smaller, the quotient is 8 and the remainder is 19. The numbers are:
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The sum of two numbers is 2490. If 6.5% of one number is equal to 8.5% of the other then the numbers are:

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If X stands for a(x+y) and Y stands for b(x-y), then the value of Xa-Yb is_____.
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Which of the equations listed below expresses the following problem: 'Think of number, subtract 4, divide the result by 3 and add 6. The result is equal to the original number.'?
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The possible solution to the equation (x-5)2=4(x-5) is______.
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The average of three consecutive positive integers, such that the square of their sum exceeds the sum of their squares by 214, is equal to: