A third of Karim’s marks in Mathematics exceeds a half of his marks in social studies by 30, if Karim got 240 marks in the two subjects together, how many marks did he get in Social Studies?
সমাধান
সঠিক উত্তর: Option C
Let marks of Karim's Mathematics be = m
And, marks of Karim's Social Studies be = s
Then, A/Q,
m/3 - s/2 = 30
(2m - 3s)/6 = 30
2m - 3s = 180 .................. (1)
And, we know that, m+s = 240 ............... (2)
multipying (2) with 2, we get,
2m + 2s = 480 ................. (3)
From (3) - (1), we get,
2m + 2s - 2m +3s = 480 + 180
5s = 660
s = 660/5 = 132
