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Three times a number is less than (21). If the number is (x), which inequality is correct?

Answer and explanation

Correct answer: (3x<21)

The direct answer is A: \(3x<21\). Translate each phrase carefully. “A number” is x. “Three times a number” means multiplying x by 3, giving 3x. “Is less than 21” gives the symbol <, so the complete inequality is \(3x<21\). It could also be solved as x<7 by dividing by positive 3, but the question asks for the correct statement and A is the direct translation. Option B, \(3x>21\), reverses “less than” and says greater than. Option C, \(x+3<21\), means 3 is added to x, not that x is multiplied by 3. Option D, \(x/3<21\), means one-third of x is less than 21, which is a different sentence. The order matters: “three times x” is 3x, not x+3 or x/3. Memory cue: times means multiplication; less than means the left expression is smaller.

Related tags

Linear-InequalitiesWord-To-SymbolTranslation

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