book Maths Puzzle Numerical Ability

An item sells for $48 after a 20% discount. What was the original price of the item?
My answer was $60
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book Other Question

solve each system


4x+8y+z=2
x+7y-3z=-14
2x-3y+2z=23
how do i solve for X in this problem: X>10 (x to the 10th power) =5555