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wat is d diff between z and x intercept in 7x+6y+9z=0

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TCS Other Question

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? Susan made a block with small cubes of 7 cubic cm volume to make a block 4 small cubes long,
4 small cubes wide and 10 small cubes deep. She realises that she has used more small cubes than she really needed.
She realised that she could have glued a fewer number of cubes together to look like a block with same dimensions,
if it were made hollow. What is the minimum number of cubes that she needs to make the block?

160
32
128
79