Mach each word problem from the top and bottom of the equation.

Question

A maple tree a diameter of 12 inches has 32 rings inside it's trunk. How many rings would be expected in a maple tree with a diameter of 20 inches? (Round to the nearest 1.)

Approximately 3 people out of every 25 are left-handed. About how would many left-handed people would you expect in a group of 140 people? ( Round to the nearest 1)

If it takes ban old computer 15 minutes to download a 45 minute Tv show, how long will it take the computer to download a 2 hour movie?

If 10 bagels cost b$3.69, how much will 12, bagels cost?

(Match each equation on the top and bottom)

2/3

40

4.43

32.5

8

53

1167

17

Answer 1

These are the questions about ratios:

1. the diameter is 12 inch, so the radius is 6 inch. so 6/32 = 10/?, => we can get ? is around 53.
2. 3/25 = ?/140, solve ? is 16.8, so we round it up to 17.
3. 2 hours is 120 mins, we can get 15/45 = ?/120, solve ? is 40 mins.
4. 10/3.69 = 12/?, we can get 4.428$, round it up to 4.43$.

Hope this can help.

Answer 2

I'll do the first. The rest are on you. Don't forget that the units have to be THE SAME, minutes to minutes or hours to hours, for example.

12/32 = 20/r

Cross multiply!

12r = 32(20)

12r = 640

r = 53 1/3

53 rings