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📐 Math Question #64 · Mar 5
⏱ 1:30
A student is saving money to buy a laptop. She already has $240 saved and earns $18 per hour babysitting. The laptop costs $492.
Which equation could be used to find h, the number of hours she must work to have exactly enough money?
A
18h = 492 ❌
B
240 + 18h = 492 ✅
C
240h + 18 = 492 ❌
D
18h − 240 = 492 ❌
💡
Explanation
The correct answer is B: 240 + 18h = 492.
  • 1
    She starts with $240 already saved — this is a constant added to her earnings.
  • 2
    She earns $18 per hour, so after h hours she earns 18h dollars.
  • 3
    Together: 240 + 18h must equal the $492 laptop cost.
  • 4
    Solving: 18h = 252 → h = 14 hours. ✓
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