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primary 6 | Maths
| Data Analysis
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Date Posted: 5 years ago
Views: 441
Starting number = x
(0.4x)+(0.28x)+(x-48) = 78
X=75
Try to understand how I derived my workings. If you need help post a comment.
(0.4x)+(0.28x)+(x-48) = 78
X=75
Try to understand how I derived my workings. If you need help post a comment.
I don't understand Darius
Assuming I have x pins. If I use 60% of my pins how many % of pins do I have left?
at first
Y: 25 u
M: 25 u
F: 25 u
used
Y: 60% of 25 u = 15 u
M: 120% of 15 u = 18 u
F: 48
left
Y: 25 u - 15 u = 10 u
M: 25 u - 18 u = 7 u
F: 25 u - 48
10 u + 7 u + 25 u - 48 = 78
u = 3
at first, each has 25x3 = 75 pins
***
in case, u wanna know why 25 u?
u can choose other nos. like 10 u, 5 u or just simply u.
the method remains the same.
...
Y: 25 u
M: 25 u
F: 25 u
used
Y: 60% of 25 u = 15 u
M: 120% of 15 u = 18 u
F: 48
left
Y: 25 u - 15 u = 10 u
M: 25 u - 18 u = 7 u
F: 25 u - 48
10 u + 7 u + 25 u - 48 = 78
u = 3
at first, each has 25x3 = 75 pins
***
in case, u wanna know why 25 u?
u can choose other nos. like 10 u, 5 u or just simply u.
the method remains the same.
...
But why plus 25u
See 1 Answer
10u+7u+25u=78+48
42u =126
1u =3
25u=75
42u =126
1u =3
25u=75
think u hv ans ur own qn of "But why plus 25u"
so shall not reply that
1. read carefully 1st
2. think over it
3. figure it out on ur own
so shall not reply that
1. read carefully 1st
2. think over it
3. figure it out on ur own
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