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## Question

primary 5 | Maths
| Percentage

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

= 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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