sstrike's answer to Nicole's Primary 6 Maths Ratio Singapore question.
OR
Algebra method
8a+4b=76
5a+3b=52
→
(1) 5×8a+5×4b=5×76
(2) 8×5a+8×3b=8×52
→ (2) - (1)
24b - 20b =
4b = 8×52-5×76
= 36 (Ans)
Algebra method
8a+4b=76
5a+3b=52
→
(1) 5×8a+5×4b=5×76
(2) 8×5a+8×3b=8×52
→ (2) - (1)
24b - 20b =
4b = 8×52-5×76
= 36 (Ans)
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