exam Maths Puzzle Numerical Ability

20x+5(x+1)= 25(x+1)-20

I came up with 20=20x
x=1

This is not one of my choices
no solution
any real number
x=0
x=5

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exam Other Question

Helen Smith just conducted a single-factor experiment and collected 30 observations. Her analysis of variance produced a sum of squares total (SST) that contained how many degrees of freedom?
a. 28
b. 29
c. 30
d. 31 find the distance between the poionts of intersection of the line with equation y=2x+1 and the parabola with equation y=x^2-4x+6.