Jia Sheng's answer to Anugerah's Primary 6 Maths Ratio Singapore question.
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Let pens be P, notebooks be N.
6P + 3N = 45 -- equation 1
Since Notebook costs $9 more than pen,
N= P + 9 -- equation 2
Substitute equation 2 into equation 1,
6P + 3(P + 9) = 45
6P + 3P + 27 = 45
9P = 27
P = 2
Therefore, the price of a pen is $2.
Hope this helps! All the best and don't give up!!
6P + 3N = 45 -- equation 1
Since Notebook costs $9 more than pen,
N= P + 9 -- equation 2
Substitute equation 2 into equation 1,
6P + 3(P + 9) = 45
6P + 3P + 27 = 45
9P = 27
P = 2
Therefore, the price of a pen is $2.
Hope this helps! All the best and don't give up!!
Date Posted:
3 years ago
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