Answer: [tex]29.4\ hours[/tex]
Step-by-step explanation:
Let be "x" the time would it take for a group of 7 painters to paint the same house.
According to the exercise, you know that a group of 5 painters can paint the house in 21 hours.
Then, you can write the following proportion:
[tex]\frac{21}{5}=\frac{x}{7}[/tex]
In order to find the time would it take for a group of 7 painters to paint the same house, yo must solve for "x".
Multiplying both sides of the equation by 7, you get that the value of "x" is:
[tex](7)(\frac{21}{5})=(\frac{x}{7})(7)\\\\x=29.4\ hours[/tex]
Answer:
15 hours
Step-by-step explanation:
21*5=105
105/7=15
15 hours