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primary 5 | Maths
| Rate & Ratio
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My answer is 178.60. Not sure if it correct. Thanks
Date Posted: 2 years ago
Views: 428
Nope. The mass of the recycling bin is 37.2 kg
May i know the steps? Thanks.
If you treat mass of paper as 1 unit,
Then mass of cans = 4 units
So,
4 units + mass of bin = 245.6 kg
1 unit + mass of bin = 89.3 kg
Difference = 4 units - 1 unit = 3 units
Difference also = 245.6kg - 89.3 kg = 156.3 kg
So 3 units = 156.3 kg
1 unit = 156.3 kg ÷ 3 = 52.1 kg
Mass of bin = 89.3 kg - 52.1 kg = 37.2 kg
OR
Mass of bin = 245.6 kg - 52.1kg × 4
= 245.6 kg - 208.4 kg
= 37.2 kg
This is a 'difference unchanged' type of question.
Then mass of cans = 4 units
So,
4 units + mass of bin = 245.6 kg
1 unit + mass of bin = 89.3 kg
Difference = 4 units - 1 unit = 3 units
Difference also = 245.6kg - 89.3 kg = 156.3 kg
So 3 units = 156.3 kg
1 unit = 156.3 kg ÷ 3 = 52.1 kg
Mass of bin = 89.3 kg - 52.1 kg = 37.2 kg
OR
Mass of bin = 245.6 kg - 52.1kg × 4
= 245.6 kg - 208.4 kg
= 37.2 kg
This is a 'difference unchanged' type of question.
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