exam Maths Puzzle Numerical Ability

what is 49 in creased by twice a number when it is written in an algebraic expression?

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exam Other Question

five divided by the difference of a number and 1 equals the quotient of 10 and the sum of the number and 9. find the number. a no. consist of two digit whose sum is 9. if 9 is subtacted from the no.the digit interchange their places.find the no.