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Question
primary 5 | Maths
| Rate & Ratio
2 Answers Below
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Using factors and multiples
Date Posted: 5 years ago
Views: 554
Common multiple is 300m.
For street A, 100m x 3 = 300m
So number of lampposts in 300m
= 3 x 5 = 15
For street B, 150m x 3 = 300m
So number of lampposts in 300m
= 4 x 2 = 8
Difference in number of lampposts for 300m = 15 - 8 = 7
Since total difference is 119 lampposts,
119 ÷ 7 = 17
There are 17 times of 300m.
Total number of lampposts
= 17 x 15 + 17 x 8
= 17 x 23
= 391
For street A, 100m x 3 = 300m
So number of lampposts in 300m
= 3 x 5 = 15
For street B, 150m x 3 = 300m
So number of lampposts in 300m
= 4 x 2 = 8
Difference in number of lampposts for 300m = 15 - 8 = 7
Since total difference is 119 lampposts,
119 ÷ 7 = 17
There are 17 times of 300m.
Total number of lampposts
= 17 x 15 + 17 x 8
= 17 x 23
= 391
See 2 Answers
done
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Make the distance of both streets of Shortest Equal Distance..that is your 1 unit.
Find the diff in terms of lamps in 1 unit.
Take the "total difference of both street"(119 lamps) divide by " difference in 1 unit"
->> total number of units
Lastly, multiply the total number of units of each street and add it up to get your answer.
Find the diff in terms of lamps in 1 unit.
Take the "total difference of both street"(119 lamps) divide by " difference in 1 unit"
->> total number of units
Lastly, multiply the total number of units of each street and add it up to get your answer.
Date Posted:
5 years ago
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Make them of equal distance of both streets to get 1 unit...so that you can find the difference in 1 unit.
Then divide total differences with "difference in 1 unit".. To get total units
Multiply "lamps in each unit" to the "total number of units" and add them up to get answer.
Then divide total differences with "difference in 1 unit".. To get total units
Multiply "lamps in each unit" to the "total number of units" and add them up to get answer.
Date Posted:
5 years ago
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