Answer:
The unknown number is 9/2.
Step-by-step explanation:
Let the unknown number be x.
It is given that two-thirds a number plus 4 is 7.
\(\frac{2}{3}x+4=7\)
Subtract 4 from both sides.
\(\frac{2}{3}x+4-4=7-4\)
\(\frac{2}{3}x=3\)
Multiply 3 on both sides.
\(2x=9\)
Divide both sides by 2.
\(x=\frac{9}{2}\)
Therefore the unknown number is 9/2.
