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primary 6 | Maths | Algebra
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Calisto Yeow
Calisto Yeow

primary 6 chevron_right Maths chevron_right Algebra chevron_right Singapore

Hi, this involves simultaneous linear equations in two variables, ty if you can help!

Date Posted: 3 years ago
Views: 229

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sstrike
Sstrike's answer
5603 answers (A Helpful Person)
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sstrike
Sstrike
3 years ago
A → 3p
S → 5u

⅓ × 3p = p
⅖ × 5u = 2u
p+2u = 45 ⇨
① p = 45-2u

5u×$5 + 3p×$9 = $751
② 25u + 27p = 751

① → ②
25u + 27(45-2u) = 751
u=(27×45-751)÷(2×27-25) = 16
p=45-2u=13

5u+3p
= 5×16+3×13
= 119 (Ans)