exam Maths Puzzle Numerical Ability

A group of ten 6 and 12 volt batteries are wired in series; the sum of their voltages is 84 volts. How many of each type of battery are used?

6x + 12x = 84
18x = 84 does not work

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exam Other Question
Asked to graph the ineguality 3x (3 - 7i)(2 + 4i),firstly,you expand it.(this is complex number),
(6 +12i - 14i +28 ) = 34 - 2i.ans(note: i^2 = -1.so -7i x +14i =28)
SOLVED BY JAMES(A.K.A, BOMBARD)