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primary 6 | Maths | Percentage
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Amanda
Amanda

primary 6 chevron_right Maths chevron_right Percentage chevron_right Singapore

Pls help thank you

Date Posted: 3 years ago
Views: 214

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Working backwards:
He bought 15 more red counters and caused number of red counters to increase by 20%.

Means that 20% of the original number of red counters = 15.

100% of the original number of red counters = 15 x 5 = 75

Initially, 30% of the total counters were red (the 75 red counters).
Hence to find the number of blue counters (which remained constant):
30% of initial total counters --> 75 counters
10% of initial total counters--> 75 ÷ 3 = 25
70% of initial total counters--> 25 x 7 = 175

Number of blue counters at first = 175
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