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Question 42
The following equation is incorrect. Which two signs should be interchanged to correct the equation?
19 - 16 + 5 ÷ 10 x 2 = 28
Solution
When we interchange x and - , we get 19 x 16 + 5 ÷ 10 - 2 = 302.5. Option A is wrong.
When we interchange ÷ and - , we get 19 ÷ 16 + 5 - 10 x 2 = 16.1875. Option B is wrong.
When we interchange ÷ and x , we get 19 - 16 + 5 x 10 ÷ 2 = 25. Option C is correct.
When we interchange - and + , we get 19 + 6 - 5 ÷ 10 x 2 = 24. Option D is wrong.
Hence, option C is the correct answer.
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