1.

The students in three classes are in the ratio of 2:3:4. If 40 students are added in each clas, the ratio becomes 4:5:6. Find the total number of students in all the three classes is :

Answer»

270
180
126
135

Solution :2X + 4 = 4y ...(i)
3x + 40 = 5y ...(ii)
4x + 40 = 6y ...(III)
Therefore 2x = 40 `IMPLIES x = 20`
Hence, total number of students = 2x + 3x + 4x = 9x
`9 xx 20 = 180
Alternatively It can be solved through options also.


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