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swati ghosh  no [edit] [edit photo] [ Scorecard : 473] |
Posted about 3 hours ago   |
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average age of a group of 10 students is 20 years,if average age increased by two years when two new students are joined then the average age of two new students a).84 b).64 c).32 d).42 |
Total age of 10 students=10*20=200
Total age of 2 new students = 2X
(Assuming the average age of 2 students be X.)
Hence the equation=200+2X=12*22= 264
solving the equation we get x=32
So, average age of the new students = 32
if x is inversely related with square of y for x =1 & y=2 then find the value of x when y=6 :
a).3 b).9
c).1/3 d).1/9
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