Question

A bag of 30 homemade cookies at a bake sale fundraiser costs $8.10. At this rate, how much would a bag of 10 cookies cost?

A) $2.70
B) $3.40
C) $4.20
D) $5.40

Pounds of bananas cost $7. At this rate, how many pounds of bananas can you buy with $1?
A) 0.14 pounds
B) 0.20 pounds
C) 0.25 pounds
D) 0.10 pounds

A package of sliced homemade bread with 11 slices costs $3.97. How much would a package with 18 slices cost at the same price per slice? Round to the nearest cent.
A) $6.53
B) $6.20
C) $8.91
D) $5.45

Answer 1

To find the cost of a bag of 10 cookies, set up a proportion using the number of cookies and the cost. To find the number of pounds of bananas that can be bought with $1, set up a proportion using the cost and the number of pounds. To find the cost of a package with 18 slices of bread at the same price per slice, set up a proportion using the number of slices and the cost.

Step-by-step explanation:

To find the cost of a bag of 10 cookies, we can set up a proportion using the number of cookies and the cost. The proportion will be:

30 cookies / $8.10 = 10 cookies / x

To solve for x (the cost of 10 cookies), we can cross multiply:

30 cookies * x = 10 cookies * $8.10

Dividing both sides by 10, we get:

x = (10 cookies * $8.10) / 30 cookies

Calculating the value of x, we find that a bag of 10 cookies will cost $2.70. Therefore, the correct answer is A) $2.70.

To find the number of pounds of bananas that can be bought with $1, we can set up a proportion using the cost and the number of pounds. The proportion will be:

$7 / x pounds = $1 / 1 pound

To solve for x (the number of pounds of bananas), we can cross multiply:

$7 * 1 pound = $1 * x pounds

Dividing both sides by $7, we get:

x pounds = ($1 * 1 pound) / $7

Calculating the value of x, we find that $1 can buy approximately 0.14 pounds of bananas. Therefore, the correct answer is A) 0.14 pounds.

To find the cost of a package with 18 slices of bread at the same price per slice, we can set up a proportion using the number of slices and the cost. The proportion will be:

11 slices / $3.97 = 18 slices / x

To solve for x (the cost of the package with 18 slices), we can cross multiply:

11 slices * x = 18 slices * $3.97

Dividing both sides by 18, we get:

x = (18 slices * $3.97) / 11 slices

Calculating the value of x, we find that a package with 18 slices of bread will cost approximately $6.53. Therefore, the correct answer is A) $6.53.