Question 263094
This is a mixture problem. Here is a table based on the above information:
food . .  . . . . . .$ . . . . . . . . .  lb . . . . . . . . . . $lb
pretzel . . . . . .$2.40 . . . . . . . x . . . . . . . . . .  $2.40x
chip . . . . . . . . $ 3.40 . . . . . .2-x . . . . . . . . . $6.80 - $3.40x
mixture . . . . . $3.00 . . . . . . .2 . . . . . . . . . . . .$6.00
we set third column equal to get
(i) {{{2.4x + 6.8 - 3.4x = 6}}}
combine like terms on the left to get
(ii) {{{-1x + 6.8 = 6}}}
subtract 6.8 to get
(iii) {{{-1x = -.8}}}
divide by -1 to get
 (iv) {{{x = .80}}}
we need .8 lb pretzel and 1.2 lb chips.