A) 5
B) 45
C) 50
D) 30
Correct Answer: C
Solution :
Number of children = 2x, 3x and 5x Then, \[(2x+10):\,\,(3x+10):(5x+10)=4:5:7\] \[\therefore \] \[5\,\,(2x+10)=4\,\,(3x+10)\] \[\Rightarrow \] \[x=5\] Hence, total number of the children before increase \[=10x=10\times 5=50\]You need to login to perform this action.
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