sstrike's answer to Coral's Primary 5 Maths Fractions Singapore question.
Alternative
【algebra】
left
B → 1 - ⅘ = ⅕
G → 1 - ⅔ = ⅓
at first → 5b+3g = 331 ①
left → 1b+1g = 91 ②
3×② ⇨ 3b+3g = 3×91 ③
① - ③ ⇨ 2b=331-3×91
1b = 29
⇨
5b = 5×29 = 145 (Ans)
【basically is same as the model】
【algebra】
left
B → 1 - ⅘ = ⅕
G → 1 - ⅔ = ⅓
at first → 5b+3g = 331 ①
left → 1b+1g = 91 ②
3×② ⇨ 3b+3g = 3×91 ③
① - ③ ⇨ 2b=331-3×91
1b = 29
⇨
5b = 5×29 = 145 (Ans)
【basically is same as the model】
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