I am confused on this question does anyone know?

What value of x is in the solution set of –5x – 15 > 10 + 20x?

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?