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Primary 4 | Maths
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I tried. Did Ben have $10.80 at first? :/
Date Posted: 4 years ago
Views: 268
At first,
ratio of Ali : Ben : Total = 3 : 1 : 4
In the end,
ratio of Ali : Ben : Total = 4 : 1 : 5
Notice that the amount of $ they have altogether doesn't change since Ben is just giving to Ali and not someone else.
So the number of units in total should be the same. So make them the same.
Multiply the first ratio by 5,
ratio of Ali : Ben : Total = 15 : 5 : 20
Multiply the first ratio by 4,
ratio of Ali : Ben : Total = 16 : 4 : 20
So you can see that there are 20 units of $ in total and Ben gave Ali 1 unit.
So 1 unit = $5.40
Ben had 5 units at first
So Ben's $ at first = $5.40 x 5 = $27
ratio of Ali : Ben : Total = 3 : 1 : 4
In the end,
ratio of Ali : Ben : Total = 4 : 1 : 5
Notice that the amount of $ they have altogether doesn't change since Ben is just giving to Ali and not someone else.
So the number of units in total should be the same. So make them the same.
Multiply the first ratio by 5,
ratio of Ali : Ben : Total = 15 : 5 : 20
Multiply the first ratio by 4,
ratio of Ali : Ben : Total = 16 : 4 : 20
So you can see that there are 20 units of $ in total and Ben gave Ali 1 unit.
So 1 unit = $5.40
Ben had 5 units at first
So Ben's $ at first = $5.40 x 5 = $27
See 2 Answers
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Hi there, hope this helps :)
Date Posted:
4 years ago
Thank you but my school hasn’t taught the x way. Only models. So I don’t understand:/
Hi, I uploaded a new method. Go check it out :)
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Hey, I see! Does this new method make sense to you? :)
Date Posted:
4 years ago
Hi Alice, thank you very much. I’m so sorry I still don’t understand
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