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primary 5 | Maths | Percentage
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Mandy
Mandy

primary 5 chevron_right Maths chevron_right Percentage chevron_right Singapore

Please kindly explain why is the answer 220.Thank you in advance.

Date Posted: 6 months ago
Views: 101
J
J
6 months ago
Difference between no. of red pebbles at the end and no. of red pebbles at first

= 63 units - 33 units
= 30 units

30 units = 60 pebbles
1 unit = 60 pebbles ÷ 30 = 2 pebbles

So total number of pebbles at first
= 33 units (red at first) + 77 units (blue at first)

= 110 units

110 units = 110 x 2 pebbles
= 220 pebbles

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Mandy Ng Zi Jun
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