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Question
primary 6 | Maths
| Algebra
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Pls help thx
Date Posted: 3 years ago
Views: 236
Method : Grouping difference
Add 35 silver stars first, to make the number same as gold stars.
Points from these 35 silver stars
= 35 × 3
= 105
With these 35 stars, the difference in points is now lower.
New difference = 730 - 105 = 625
With the same number of gold and silver stars now, look at the difference between 1 gold and 1 silver star's points
8 - 3 = 5
How many sets of these are needed to get a difference of 625 stars?
625 ÷ 5 = 125
So 125 gold stars score 625 more points than 125 silver stars.
This tells you that there were 125 gold stars in the first place.
Add 35 silver stars first, to make the number same as gold stars.
Points from these 35 silver stars
= 35 × 3
= 105
With these 35 stars, the difference in points is now lower.
New difference = 730 - 105 = 625
With the same number of gold and silver stars now, look at the difference between 1 gold and 1 silver star's points
8 - 3 = 5
How many sets of these are needed to get a difference of 625 stars?
625 ÷ 5 = 125
So 125 gold stars score 625 more points than 125 silver stars.
This tells you that there were 125 gold stars in the first place.
Total number of stars shot
= Gold + silver
= 125 + (125 - 35)
= 125 + 90
= 215
Check:
Points from 125 gold stars = 125 × 8 = 1000
Points from 90 silver stars = 90 × 3 = 270
Difference = 1000 - 270 = 730 ✓
= Gold + silver
= 125 + (125 - 35)
= 125 + 90
= 215
Check:
Points from 125 gold stars = 125 × 8 = 1000
Points from 90 silver stars = 90 × 3 = 270
Difference = 1000 - 270 = 730 ✓
Thank you
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Hope this helps
Date Posted:
3 years ago
sorry, but why divided by 5?
We know that he score 450 point more on Gold star.
Each gold star has 8 -3 = 5 points more then silver star.
5 points → 1 star
450 points → 450÷5 =90.
Each gold star has 8 -3 = 5 points more then silver star.
5 points → 1 star
450 points → 450÷5 =90.
ohh! okay, thank u!
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