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primary 6 | Maths
| Percentage
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Date Posted: 5 years ago
Views: 400
Let S represent Nina's salary.
She spent $2800 on a TV.
She also spent 6/10 * (S - $2800) on a sofa.
Then, she had 3/10 S left.
S - $2800 - 6/10 * (S - $2800) = 3/10 S
First, we expand out:
S - $2800 - 6/10 S + $1680 = 3/10 S
Shift the variables to one side:
7/10 S = $1120
Lastly, we multiply 10/7 on both sides:
S = $1600
She spent $2800 on a TV.
She also spent 6/10 * (S - $2800) on a sofa.
Then, she had 3/10 S left.
S - $2800 - 6/10 * (S - $2800) = 3/10 S
First, we expand out:
S - $2800 - 6/10 S + $1680 = 3/10 S
Shift the variables to one side:
7/10 S = $1120
Lastly, we multiply 10/7 on both sides:
S = $1600
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Date Posted:
5 years ago
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