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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.
Date Posted: 5 years ago
Views: 640
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
= 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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