Devon paid for 4 pounds of bananas with a $10 bill. He got back $4.00. What was the cost of 1 pound of bananas?
1 answer:
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Let's call the number we're looking for . We know that
is twice as much as
.
Twice as much as a number simply means the double of that number, and in turn the double of a number means to muliply that number by 2.
So, in order to obtain , you have to multply
by 2. In formula, you have
or simply