Water and oil are mixed in the ratio 3:5. Find the density of the mixture if the density of water is 1g/cm ^3 and that of oil is 0.8g/cm^3

Density of mixture is 7.0 g/.

Step-by-step explanation:

Density of mixture = density of water in the mixture + density of oil in the mixture

Given: water and oil were mixed in a ratio 3:5

           density of water is 1.0 g/ and that of oil is 0.8 g/.

Then,

density of water in the mixture = 3 x 1.0 g/

                                   = 3.0 g/

Density of the volume of water in the mixture is 3.0 g/.

density of oil in the mixture = 5 x 0.8 g/

                                              = 4.0 g/

Density of oil in the mixture is 3.0  g/.

So that,

Density of mixture = 3.0 + 4.0

                               = 7.0

Density of mixture is 7.0 g/.

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

2nd one in the first row is correct