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5) 170 = {(10 . 165) + (4 . x) }/ 14
(14 . 170) = 1650 + 4x
4x = 2380 - 1650
x = 730 : 4 = 182,5
6) 7,5 ={ (3 × 7,2) + x} /4
7,5 . 4 = 21,6 + x
x = 30 - 21,6 = 8,4
7) 45 + 70 = 115 siswa