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lk + lb = 1 m
lk + 0, 4 = 1
lk = 1 - 0, 4
lk = 0, 6 m
M = lk/lb
M = 0, 6/0, 4
= 6/10 / 4/10
= 6/10 × 10/4
M = 3/2
M = w/f
3/2 = w/75
w = 3/2 × 75
w = 225/2
maaf klo salah, nggak yakin saya sm jawaban saya sendiri