Answer:
1 lb of peaches costs 6.52 dollars
Explanation:
You can solve this problem using the rule of three.
You might want to follow these steps:
1. Analyze the giving data
2. Organize it and write the proportions
3. Clear the x value
4. Solve by multiplying or dividing
Now for the exercise:
Data:
$11.50 euros per 1 kg
1 euro is 1.25 dollars
Conversion factor 1 kg = 2.02462 lb
The problem is asking how much will be the cost in dollars to buy 1 lb of peaches? As you can see! You need to change the units to modify the data information.
Remember that 1 kg = 2.02462 lb
First change the kg to lb, in this case use directly the conversion factor:
2.02462 lb = 1 kg
Now you want to know the cost of 1 lb
1 lb ----> x euros?
2.20462 lb -----> 11.50 euros
Clear the incognite x euros?
1 lb (11.50 euros) = x euros? (2.20462 lb)
x euros? = 1 lb (11.50 euros) / 2.20462 lb = 5.22 euros
The cost of 1 lb of peaches will be 5.22 euros, but you need to know the cost in dollars.
You will need to write another proportion:
1 euro -----> 1.25 dollars
5.216 euros -----> x dollars?
Now solve for incognite x dollars?
1 euro (x dollars?) = 1.25 dollars (5.216 euros)
x dollars? = 1.25 dollars (5.216 euros)/(1 euro) = 6.52 dollars
Now you that 1 lb of peaches costs 6.52 dollars
