exam Maths Puzzle Numerical Ability

x -a=-x+a+4b

1 s + 7 = 4 s
3 9 3

7 = -14
12

9- 2m =19
7

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exam Other Question

Two cars start toward each other at the same time from two cities 382.5 km apart. If one car averages 40 km/hr and the other 45 km/hr, How much time will elapse before they meet A sample of 26 is selected from the population. What is the number of degrees of freedom used to determine the appropriate critical t-value?
A) 20
B) 19
C) 24
D) 25
E) None of the above