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Question
primary 6 | Maths
| Algebra
One Answer Below
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Date Posted: 3 years ago
Views: 482
assumption method
assumed all 20 tickets r $8
($180-20×$8)÷($12-$8) = 5 → # of $12
assumed all 20 tickets r $12
(20×$12-$180)÷($12-$8) = 15 → # of $8
Chk
15×$8 + 5×$12 = 180 ✓
assumed all 20 tickets r $8
($180-20×$8)÷($12-$8) = 5 → # of $12
assumed all 20 tickets r $12
(20×$12-$180)÷($12-$8) = 15 → # of $8
Chk
15×$8 + 5×$12 = 180 ✓
See 1 Answer
done
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clear
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using trial and error
Date Posted:
3 years ago
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