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primary 6 | Maths
| Measurement
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Date Posted: 5 years ago
Views: 317
R:J is 4:5
After J spent 7/10 of her money, she has $120 less than R.
I see the numbers 5 and 10. We change 4:5 into 8:10 for easy computation.
At the start, R had 8 units and J had 10 units. After J spent 7 units (i.e. 7/10 of her money), she had 3 units of money left.
So in the end, R had 4 units and J has 3 units. Since J had $120 less than R at this point, the extra 1 unit represents $120.
Since R had 4 units at first, R must have had $480 at first.
After J spent 7/10 of her money, she has $120 less than R.
I see the numbers 5 and 10. We change 4:5 into 8:10 for easy computation.
At the start, R had 8 units and J had 10 units. After J spent 7 units (i.e. 7/10 of her money), she had 3 units of money left.
So in the end, R had 4 units and J has 3 units. Since J had $120 less than R at this point, the extra 1 unit represents $120.
Since R had 4 units at first, R must have had $480 at first.
May I know R should be 8u and J should be 3u right? Because we already convert es to 8u:10u.
Oops sorry, I had forgotten that I had changed 4 to 8 already.
Yes, you are right.
In view of this, the 5 units difference represents $120. After calculation, you should get 1 unit as $24 and 8 units as $192 so R had $192 at first.
We deal with the new ratios at this point as the ‘units’ are related to the new ratio, not old one.
Yes, you are right.
In view of this, the 5 units difference represents $120. After calculation, you should get 1 unit as $24 and 8 units as $192 so R had $192 at first.
We deal with the new ratios at this point as the ‘units’ are related to the new ratio, not old one.
Thank you very much.
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Hope this helps
Date Posted:
5 years ago
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