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Sagot :
Cost of 12 notebooks = $9
Ratio of number of notebooks to its price
= 12:9
= 4:3 (because we reduced it to the simplest form by dividing both numerator and denominator by 3)
Let the cost of 8 notebooks be x.
Then, 8:x = 4:3
=> 8/x = 4/3
=> (8×3)/4 = x
=> 24/4 = x
=> 6 = x
So, the cost of 8 notebooks is $6.
You can do 13 divided by 9 to see how much each binder costs. 12 divided by 9 is 0.75 which means, that each binder is 75 cents. To get your answer do 0.75 x 8. Which equals 6. Which means 8 binders would cost six dollars
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