TCS Company Numerical Ability Age Problem

in a market 4 men are standing. the average age of the four before 4 years is 45, after some days one man is added and his age is 49 ,what is the average age of all?

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TCS Other Question

The Jumbo circus is performing in the city and the jumbo circus' main attraction is a group performance by a variety of performers. In this group belonging to the same category weight the same. The musicians are heavier than singers and the dancers are lighter than guitarist. Further the artist have same weight as the dancers. The average height of the above mentioned people reduces by 2cm if I replace the guitarist with a joker. Find the height of the joker, if the height of the guitarist is 184cm
Option
a) 154cm
b) 171cm
c) 158 cm
d) 160cm
wat is d diff between z and x intercept in 7x+6y+9z=0