Explanation

Let x = number of machine parts Frank can make in 7 hr. Set up a proportion:

\(\frac{4}{21}=\frac{7}{x}\)

\(4x=7\times21\) \(x=\frac{7\times21}{4}=36.75\)

In his will, Mr. Adams left 25% of his estate to his wife and unevenly divided the balance between his son and his daughter. If the son received \(\$36,000\) as his share, what was the total value of the estate?

In a chess tournament where the participants were to play one game with another, two players fell ill having played 3 games each. If the total number of games played is 84, the number of participants at the beginning was