Question

Soal:
mean berat badan Ali,Budi,Candra = 60kg
mean berat badan Ali,Budi = 55kg
mean berat badan Budi,Candra = 65kg

Hitung berat badan anak masing-masing

Answer 1

Misal BB Ali = x
Budi = y
Candra = z
(x + y + z) / 3 = 60
x + y + z = 60 × 3 = 180
(x + y) / 2 = 55
x + y = 2 × 55 = 110
(y + z) / 2 = 65
y + z = 2 × 65 = 130
x + y + z = 180
x + 130 = 180
x = 180 - 130 = 50
x + y + z = 180
110 + z = 180
z = 180 - 110 = 70
x + y + z = 180
50 + y + 70 = 180
y = 180 - 120 = 60
jadi BB Ali = 50 kg
Budi = 60kg
Candra = 70kg