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primary 5 | Maths
| Fractions
2 Answers Below
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I don't know what is the next step . I just managed to get 39 but I think not end yet.
Date Posted: 3 years ago
Views: 310
Sugar : $2.50 per pack
Cocoa powder : $6.50 per pack
Concept : grouping
Since there are thrice as many packets of sugar bought as packets of cocoa powder, their ratio is 3 : 1
Group every 3 packets of sugar with 1 packet of cocoa powder.
Total cost in 1 group
= $2.50 × 3 + $6.50
= $7.50 + $6.50
= $14
Number of groups you can get with $546
= $546 ÷ $14
= 39
Since there are 3 packets of sugar in every group,
Number of sugar packets bought
= 39 × 3
= 117
Cocoa powder : $6.50 per pack
Concept : grouping
Since there are thrice as many packets of sugar bought as packets of cocoa powder, their ratio is 3 : 1
Group every 3 packets of sugar with 1 packet of cocoa powder.
Total cost in 1 group
= $2.50 × 3 + $6.50
= $7.50 + $6.50
= $14
Number of groups you can get with $546
= $546 ÷ $14
= 39
Since there are 3 packets of sugar in every group,
Number of sugar packets bought
= 39 × 3
= 117
Yes I got it right but just not sure why 39 x 3 . So weirdo. Means 39 pack x 3 sugar . Find it no logic
It's not 39 packs × 3 sugar.
It's 39 Groups × 3 packets of sugar in each group.
It's 39 Groups × 3 packets of sugar in each group.
You have to × 3 because when you grouped the cocoa and sugar packets together,
Every group has 1 cocoa pack and 3 sugar packets.
2 groups would be :
2 cocoa packs and 6 sugar packs
3 groups would be :
3 cocoa packs and 9 sugar packs.
39 groups would be :
39 cocoa packs and 117 sugar packs.
The idea of grouping is that the ratio always stays the same.
39 : 117 = 3 : 9 = 2 : 6 = 1 : 3
The simplest ratio is always 1 : 3. Which satisfies the question information that there are 3 times as many sugar packets bought as compared to cocoa packets
Every group has 1 cocoa pack and 3 sugar packets.
2 groups would be :
2 cocoa packs and 6 sugar packs
3 groups would be :
3 cocoa packs and 9 sugar packs.
39 groups would be :
39 cocoa packs and 117 sugar packs.
The idea of grouping is that the ratio always stays the same.
39 : 117 = 3 : 9 = 2 : 6 = 1 : 3
The simplest ratio is always 1 : 3. Which satisfies the question information that there are 3 times as many sugar packets bought as compared to cocoa packets
Ooo so 39 is coco and sugar must x3 . I got it . Thanks
See 2 Answers
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$2.50 : $4 = 5 : 8
5×3+1×(5+8) = 28
$546÷28 = $19.50
5×3×19.50÷2.50 = 117 (Ans)
5×3+1×(5+8) = 28
$546÷28 = $19.50
5×3×19.50÷2.50 = 117 (Ans)
Date Posted:
3 years ago
How to get 5:8 ?
2.5：4=5：8
（×2 at both sides）
（×2 at both sides）
It's been stated in the picture already
Oh. 2.50 also can be ratio
Thank thank . I got it. Thank you
Usually for ratio we leave it in whole numbers at your level.
So the 2.50 : 4 is changed to 5 : 8
So the 2.50 : 4 is changed to 5 : 8
Vk u r welcome
You have one more step to go. See main comments for explanation.
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