Algebra practice question

Answer: 0.5 or 0.50 or 1/2

b + (b + 10) = 11 gives 2b = 1, so b = 0.50.

Common wrong answers

If you answered 1

1 assumes the book is exactly $10; then the total would be $11 only if the bookmark were $1, but the book would then be $11.

If you answered 10

10 is the difference, not the bookmark's price.

If you answered 10.5

10.5 is the book's price.

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