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5x = 3x + 8
5x - 3x = 8
2x = 8
x = 4
maka diagonal = 5x = 5 x 4 = 20 cm
nomor 2
40 = suka gambar + suka nyanyi - suka gambar dan nyanyi + tidak suka apa-apa
40 = 20 + 15 - 5 + tdk suka apa-apa
40 = 30 + tdk suka apa-apa
40-30 = tdk suka apa2
10 = tak suka apa2
5x = 3x + 8
5x - 3x = 8
2x = 8
x = 8 / 2
x = 4
p diagonal = 5x = 5 * 4 = 20 cm
2) Total = 40
Menggambar = 20
Menyanyi = 15
Keduanya = 5
Menggambar = 20 - 5 = 15
Menyanyi = 15 - 5 = 10
Tidak suka keduanya = 40 - (15 + 10 + 5)
= 40 - 30
= 10 siswa