JAMB UTMEMathematics2022

If x is 25% of 80, find x.

A10
B15
C20CORRECT
D25
AI
Toasta AI Explanation
Why the answer is C, and why the others tempt you.
**The reasoning** When you see "x is 25% of 80," you're being asked: what number do you get when you take 25% of 80? The formula is straightforward: **x = (25/100) × 80** Let's work it: - x = 0.25 × 80 - x = 20 You can also think of it as fractions: 25% = ¼, so you're finding one-quarter of 80. - 80 ÷ 4 = 20 ✓ **Why the wrong options tempt you** - **A (10)**: You might calculate 25% of 40 instead, or divide 80 by 8 by mistake. - **B (15)**: This looks "in the middle" but has no mathematical basis here — pure distraction. - **D (25)**: The trap of just picking the percentage itself! The question gives you 25%, but that's not the answer. **Quick takeaway** "Percent *of*" means multiply: convert the percentage to a decimal (or fraction), then multiply by the number — so 25% of 80 = 0.25 × 80 = 20.
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