Question 309711
Deep thought Granola = x lb
-> nuts = 25/100 * x = 0.25x
Oat Dream Granola = y lb
-> nuts = 10/100 * y = 0.1y


(1) x + y = 20
(2) 0.25x + 0.1y = 0.19 * 20
-> 0.25x + 0.1y = 3.8
multiply equation (1) by 0.25:
(1) 0.25x + 0.25y = 5
(2) 0.25x + 0.1 y = 3.8
------------------------ (-)
0.15y = 1.2
y = 1.2/0.15 = 120/15 = 8
x + y = 20
x + 8 = 20
x = 20 - 8
x = 12


so, deep thought granola needed = 12 lb
oat dream granola needed = 8 lb