how do I add up the money cost of everything
Lucy is knitting a blanket and needs to buy some more yarn. At her local craft store, 2 balls of yarn cost $7 and 8 balls of yarn cost $28. If Lucy needs 20 balls of yarn to finish the blanket, how much money will it cost?
A.
$49
B.
$56
C.
$70
D.
$140
To find out how much money it will cost Lucy to buy 20 balls of yarn, we need to first determine the cost of one ball of yarn.
We can create a proportion using the information given:
2 balls of yarn cost $7
So, 1 ball of yarn would cost $7/2 = $3.50
Now we can find out the total cost of buying 20 balls of yarn:
20 balls of yarn * $3.50 per ball = $<<20*3.5=70>>70
Therefore, it will cost Lucy $70 to buy 20 balls of yarn to finish the blanket.
The answer is C. $70