Two- thirds of a number added to itself is 20. what is the number?

Equation

Let the number = x

(2/3)x + x = 20                   Change the x to thirds.

(2/3)x + 3/3x = 20              3/3 = 1 Now  combine the like terms.

(2 + 3)/3 = 20                     2/3 + 3/3 = 5/3  

(5/3) x = 20                        Multiply both sides by 3/5

(5/3)*(3/5)x = 20*3/5        Complete the multiplication on the right

x = 4 * 3                            Combine

x = 12                                 Answer

98 points djdjsi zisksis sjsjsi sisksj sksjdj sksks sjsisj

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.