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primary 6 | Maths | Data Analysis
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Date Posted: 1 week ago
Views: 12
snell
Snell
1 week ago
nos.
nb: 1u
p: 4u
e: 3u


cost
nb + p + e = 62.40

nb + 9.60 = p

e + 4.80 = nb

nb + nb + 9.60 + e = 62.40
nb + nb + 9.60 + e = 62.40
e + 4.80 + e + 4.80 + 9.60 + e = 62.40
e = 14.40

nb = 19.20

p = 28.80


unit cost
nb = e + 2.40

19.20/u = 14.40/3u + 2.40
19.20/u = 4.80/u + 2.40
u = 6

24 pencils bought


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