Amanda cut a wire into 4 equal pieces the wire was not originally 7.92meters long how long is each piece?
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Hello!
To solve exercise 9, we must use the rule of three.
Note that the initial price was R12 (corresponds to 100%).
The new price is R10.8 (we'll consider x%).
Using the rule of three, we will have:
Now, let's calculate the difference between the initial percentage and the new percentage:
10% of decrease.
Solve:
We need to isolate k, so multiply both sides by the denominator, which is 64. When we do that, the fraction will cancel and we get:
If you want to check, plug in your answer to the original equation and see if it is true:
This statement is true, so .