Answer:
Step-by-step explana
the cost of one package of crackers is x (dollars)
the cost of one package of cookies is y (dollars)
the cost of one candy bar is z (dollars)
(0 < x;y;z < 3,5)
a snack bag containing 6 of each type of snack costs 21.00
=> 6x + 6y + 6z = 21.00 <=> x + y + z = 3,5 (1)
a snack bag containing 8 packages of crackers, 5 packages of cookies and 10 candy bars costs 26.00 => 8x + 5y + 10z = 26.00(2)
containing 5 packages of crackers, 4 packages of cookies, 7 candy bars costs 18.50 => 5x + 4y + 7z = 18.50 (3)
(1),(2),(3) => x + y + z = 3,5
8x + 5y + 10z = 26
5x + 4y + 7z = 18,5
<=> x = 0,75
y = 1,5
z = 1,25
=> the cost of one candy bar is 1,25 dollars
