· A = number of ounces of the first alloy

· B = number of ounces of the second all

· A+B=32

· 0.16 A +0.28 B = 32 x 0.25

· Since A + B = 32, we know that A = 32 – B. You can then re-write the equation above as 0.16 (32-B) + 0.28 B = 32 x 0.25

· This can be simplified to 5.12- 0.16 B + 0.28 B =8

· Or, 0.12 B = 2.88

· Or B = 24

· So A = 8