1/D + 1/2D = 1/F
1/(D–1) + 1/3(D–1) = 1/F
1/D + 1/2D = 1/(D–1) + 1/3(D–1)
3/2D = 4/3(D–1)
8D = 9(D–1)
D = 9
1/F = 1/9 + 1/18 = 1/6
F = 6
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Answers & Comments
1/D + 1/2D = 1/F
1/(D–1) + 1/3(D–1) = 1/F
1/D + 1/2D = 1/(D–1) + 1/3(D–1)
3/2D = 4/3(D–1)
8D = 9(D–1)
D = 9
1/F = 1/9 + 1/18 = 1/6
F = 6