book Maths Puzzle Numerical Ability

When a pair of blue jeans is made the leftover denim scraps be recycled to make stationery,pencils,and more denim.One pound of denim is left after making every five pair of jeans.

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book Other Question
8(z+7)-6 = z+60-10

Z=0 the sum of the digits of a two-digit number is 12. if the digits are reversed, the new number is 18 less than the original number. find the original number.