What value goes in the box to make the equation $5+\square=10+20$ true?
(A) 30
(B) 15
(C) 35
(D) 20
(E) 25
The right side of the equation is $10+20=30$.

The equation is true when the left side is also equal to 30 .

Since $5+25=30$, the value that goes in the box to make the equation true is 25 .

ANSWER: (E)