WiFi's answer to Catherine Wee Mui Chin's Primary 3 Maths Singapore question.
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If all 14 box is small, total quantity = 14 x 30 = 420
For every big box, total quantity increase by 50-30 = 20
Number of big boxes = (520-420) / 20 = 100/20 = 5
Number of small box = 14 - 5 = 9
Check back:
5 x 50 = 250
9 x 30 = 270
Total number = 520
For every big box, total quantity increase by 50-30 = 20
Number of big boxes = (520-420) / 20 = 100/20 = 5
Number of small box = 14 - 5 = 9
Check back:
5 x 50 = 250
9 x 30 = 270
Total number = 520
Date Posted:
4 years ago
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