You are trying to find the price of the whole mixture per pound. So first you multiply 3 and $1.7 and then multiply 5 and $0.90 then we divide the total cost by the number of pounds bought and you arrive at the answer $1.2.
A = ( b × h ) ÷ 2; where A = the area of the triangle; b = the base of the triangle; h = the height of the triangle; 24 = ( 4 × h ) / 2 ; 48 = <span> 4 × h; h = 48 </span>÷ 4; h = 12cm.
The key to this problem, and the whole reason for assigning it for practice, is to remind you that "two fifths" and "0.4" are the same number. The answer to the question is: " Of course ! "