Translate the sentence into an equation using n as the unknown number. Then solve the equation for n. Two times a number increased by 5 is 15.

“Two times a number” is 2n, and increasing it by 5 gives 2n + 5 = 15. Subtract 5 from both sides to get 2n = 10, then divide by 2: n = 5. Choice b gives both the correct equation and solution.

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