Question 1049841
Let the amount of blend that costs 9 be x. Since we want a total quantity of 70, then the amount of $3 blend will be 70-x
:
9x+3(70-x) = 4.80(70)
9x+210-3x = 336
6x = 126
x = 21 He will need 21  pounds of the $9 tea and 
70-21 = 49 pounds of the $3 tea to get 70 pounds at $4.80
:
John