The answer would be 3 and 11/16. First add the 1 and 5/8 to 2 and 3/16. Subtract this sum from the total 7 1/2 pounds. This will give the weight of grapefruit.
Let, the weight of Grapefruit = x It would be: x + 1 5/8 + 2 3/16 = 7 1/2 x + 13/8 + 35/16 = 15/2 16x+26+35 /16 = 15/2 16x+61/16 = 15/2 2(16x+61) = 15*16 32x + 122 = 240 x = 118/32 x = 3.68 x = 3 11/18 Pound