Yang's answer to A student's Primary 5 Maths Fractions Singapore question.
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Let A be chocolate bar and B be lollipop
B - A = 14
B =14 + A
After sales
3/5 A + 4/7 B = 213
21A + 20B = 7455
Sub B = 14 + A into equation
21A + 20(14 + A) =7455
21A + 20A + 280 =7455
41A = 7175
A = 175
Therefore there were 175 chocolate bar at first.
B - A = 14
B =14 + A
After sales
3/5 A + 4/7 B = 213
21A + 20B = 7455
Sub B = 14 + A into equation
21A + 20(14 + A) =7455
21A + 20A + 280 =7455
41A = 7175
A = 175
Therefore there were 175 chocolate bar at first.
Date Posted:
4 years ago
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