joylene allyssa chen's answer to Santhosh's Primary 6 Maths Percentage Singapore question.
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b - 112 = g
3/8 b = 3/5g + 15
15b = 24g + 600
g = 1/24 (15b - 600)
b - 112 = 1/24 (15b - 600)
24b - 2688 = 15b - 600
9b = 2088
b = 232
g = 232 - 112 = 120
No. Of boys who performed = 232 x 5/8 = 145
No. Of girls who performed = 120 x 40% = 48
No. Of students who took part in the performance = 48 + 145 = 193
3/8 b = 3/5g + 15
15b = 24g + 600
g = 1/24 (15b - 600)
b - 112 = 1/24 (15b - 600)
24b - 2688 = 15b - 600
9b = 2088
b = 232
g = 232 - 112 = 120
No. Of boys who performed = 232 x 5/8 = 145
No. Of girls who performed = 120 x 40% = 48
No. Of students who took part in the performance = 48 + 145 = 193
Date Posted:
4 years ago
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