AlgebraMediumLeast number of additional sessions to meet a target
Algebra practice question
Elena must practise for at least 400 minutes this week. She has already done 4 sessions of 45 minutes each. What is the least number of additional 30-minute sessions she must do?
Answer: 8
She has done 180 minutes, so she needs at least 220 more: 30s ≥ 220 → s ≥ 7.33. The least whole number is 8.
Common wrong answers
- If you answered 5
- 5 comes from 220 ÷ 45, using the wrong session length.
- If you answered 7
- 7 sessions give 210 minutes, 10 short.
- If you answered 14
- 14 comes from 400 ÷ 30 rounded up, ignoring what is done.
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