Mrs. Porter purchased 10 grapefruit and 20 plums. One grapefruit weighs the same as 3 plums. The weight of all 30 pieces of fruit is 175 ounces. The total weight of 2 grapefruits and 8 plums is (blank) ounces. Please help.

Answer 1

You are told that
g = 3p
10g+20p=175

so,

10*3p + 20p = 175
50p = 175
p = 7/2
g = 3p = 21/2

2g+8p = 2(7/2)+8(21/2) = 88

Answer 2

Thanks again