Question

The hanger image below represents a balanced equation.
A balanced hanger diagram. The left side has 1 square labeled 6 and 1 hexagon labeled d. The right side has 1 square labeled 21.
\[6\]
\[d\]
\[21\]
Find the value of
\[d\] that makes the equation true.
\[d=\]

Answer 1

The balance gives 6 + d = 21. Subtract 6 from both sides: d = 21 − 6 = 15.