M4maths Maths Puzzle Numerical Ability Number System

Same er doing a piece in 9 hours angry rajeev doing the same job in 8 hours. But the boss will say to take navin for complete this job within 3rd. After completing the boss will pay them 7200. Then how much money navin will take?

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M4maths Other Question
For a sphere of radius 10 cm, the numerical value of the surface area in how many percent of the numerical value of its volume:
OPtion
1) 26.5 %
2) 25 %
3) 24 %
4) 27 %
5) 30 %
6) 34.5 %
7) 45 %
8) 46.5 %
9) 48 %
10)None of these 142, 251, 381, 463, .....?
OPtion
1) 527
2) 558
3) 421
4) 466
5) 574
6) 585
7) 454
8) 572
9) 432
10)None of these