A store has apples on sale for $3.00 for 2 pounds. How many apples can you buy with $9.00?
Using ratios: You can solve this problem using ratios. The ratio of cost to pounds of apples is $3.00 to 2 pounds. This means that for every $3.00 spent you can buy 2 pounds of apples. Since you have $9.00 you can buy three times as many apples as you could with $3.00, therefore you can buy 6 pounds of apples for $9.00.
You can make a table to see this a little better.
$3.00 2 pounds
$6.00 4 pounds
$9.00 6 pounds
The table shows that for every $3.00 spent you can buy 2 more pounds of apples. If you went to the cashier and gave them $3.00 you could buy 2 pounds of apples. For $3.00 more, you could buy 2 more pounds of apples. Finally, for another $3.00 you could buy 2 more pounds of apples. You then would have spent a total of $9.00 and bought 6 pounds of apples.
Using unit cost: You could also find the unit cost of the apples, by finding out how much one pound of apples would cost. This is done buy dividing the cost ($3.00) by the amount (2 pounds). This would give you a unit cost of $1.50 per 1 pound of apples. If you divide $9.00 by $1.50 per pound, you get 6 pounds of apples.
Answer: If apples cost $3.00 for 2 pounds, you can buy 6 pounds for $9.00.
It is like if a lollipop is worth `$2` and you have `$10` at hand, you can but 5 pieces of lollipop.
To figure that out, you will apply division `($10)/($2) = 5` .
Same thing with this problem, you know that for a` $3` you can have `2` pound of apple, so how do you know the amount of apple you can have with a $9 at hand?
Applying the division to find the number of `2` pounds of apple that you can have: `($9)/($3) = 3` .
It means, you can have `3` of `2 ` pounds of apple, therefore `3 * 2 = 6` pounds of apple.
Therefore, for a `$9` that you have you can have `6` pounds of apple.
That is it! :)