The scores of geography, economics and science are 38, 76, 80 respectively.
Let Yakubu scored x marks in geography.
Given that the score of him in economics is twice of the score of him in geography.
So, his score in economics = 2x
Again it is given that, the score in science is 4 more than the score in economics.
So the score in science = 2x+4
According to question the combined total score is 194. So the suitable equation is,
x+2x+2x+4 = 194
Solving the equation we get,
5x+4 = 194
5x = 194-4
5x = 190
x = 190/5
x = 38
So the score in geography = 38
the score in economics = 2x = 2*38 = 76
the score in science = 2x+4 = 2*38+4 = 76+4 = 80
Hence the scores of geography, economics and science are 38, 76, 80 respectively.
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