Question 1017498
x+y = 20 subtract x from both sides:
y = 20-x We will use this value for y next
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0.30x+0.25y = 0.28(20) Substitute for y:
0.30x+0.25(20-x) = 0.28(20) Multiply on both sides
0.30x+5-0.25x = 5.6 Subtract x on left, subtract 5 on both sides
0.05x = 0.6 Divide both sides by 0.05
x = 12 they need 12oz of 30% peanuts and:
20-12 = 8oz of the 25% mix.