Discussion
In the following question, by using which mathematical operators will the expression become correct?
15 _ 3 _ 4 _ 20
Answer: C
Correct answer: ÷, x and =
\[ 15 \div 3 \times 4 = 5 \times 4 = 20, \] so the expression closes with an equals sign. Working left to right is correct here since division and multiplication have equal precedence. The alternative with multiplication first, \( 15\times3\div4 \), gives 11.25, which is neither greater than nor less than 20 in a way that would make one of the inequality options work.
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