please help i dont understand this math: It costs $3.45 to buy 3/4 lb of chopped walnuts. How much would it cost to purchase 7.5 lbs of walnuts?

 The cost of the 7.5 lbs of walnuts be $2.16 . It costs $3.45 to buy lb of chopped walnuts.

$34.50

Step-by-step explanation:

First, find how much 1 lb costs.

To do this divide 3.45 by 3 to get 1/4 lb and then multiply by 4 to get the cost of 1 lb.

3.45/3 = 1.15      1.15 x 4 = 4.60

So 1 lb is $4.60

Multiply the cost of 1 lb by 7.5 to find the cost for 7.5 lbs

$4.60 x 7.5 = $34.50

Hope this helps!