Answer:
12 slats can be made from a board i,e 42 feet long
Step-by-step explanation:
As per the given statement: A fence builder uses boards [tex]3\frac{1}{2}[/tex] feet long for the vertical slats on the fence.
We have to calculate how many slats can be made from a board that is 42 feet long.
Builder uses board [tex]3\frac{1}{2} = \frac{7}{2}[/tex] feet long for the vertical slats.
then;
for 42 feet long = [tex]\frac{42}{\frac{7}{2} } = 42 \times \frac{2}{7} = 6 \times 2 = 12[/tex] slats can be made.
Therefore, 12 slats can be made from a board that is 42 feet long.