Question

If 5x + 13 = 31, what is the value of (5x + 31)? (a) 13 (b) 173/5) (c) 7 (d) 13 (e) 169

Answer 1

5x+13=31

5x=31-13

5x=18

x=18/5

x=3.6

now substituting the value of x in second one

(5x+31)=?

5×3.6+31

18+31

49

or

5x