The difference of the digits of a two-digit number is 7. If the digits are reversed, the
new number becomes 9/2 times the original number. Find the number.
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Step-by-step explanation:
10x+y=9/2(10y+x)
20x+2y=90y+9x
11x=88y
x=8y
x-y=7 (given)
8y-y =7
y=1
x=8
no. = 81
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