Answer:At Ralph’s fruit stand ½ pound of grapes cost 90 cents. You want to buy 5 pounds of grapes.
How much will they cost?
1. What are the two possible rates for this problem?
Solution: ½ pound/90 cents 90 cents/ ½ pound
2. Show each rate as a unit rate.
Solution: . pounds of per 1 cent 180 cents per 1 pound of grapes
3. What does each unit rate tell you?
Solution: The pounds of grapes for 1 cent
The number of cents for one pound of grapes
4. Which unit rate will help you solve the problem?
Solution: 180 per 1 pound of grapes
5. If it costs 180 cents to buy 1 pound of grapes, how much will 2 pounds cost? 4 pounds?
Complete the table below.
POUNDS
OF
GRAPES
COST IN CENTS
1 180
2 360
3 540
What pattern do you see? The cost in cents increases by 180 cents each time.
Multiply the pounds of grapes by 180 cents to get the total cost
6. Since you know the unit price, write a number sentence for the cost of five pounds of
grapes. Write an equation for the cost of any pounds of grapes.
(180 cents per pound)(5 pounds) = $9.00
(Unit rate)(pounds of grapes) = total cost
180x = y where x is the cost per pound of grapes and y is the number of pounds.
Step-by-step explanation:
