Posted by **Alex** on Monday, October 14, 2013 at 6:16pm.

Can you check the following problems, please?

1. If the ratios for microphones to karaoke machines are all equivalent, how can you find the value of x?

table:

microphones 3 9 15 36

karoke 1 3 x 12

Ans: x=5 (because divide each ratio by 3)

2 There are 32 students in Mr. Santana's class, but only 8 computers. What is the ratio of students to computers in simplest form?

Ans: 32:8 = 32/8 = 4students to 1computer

3. Solve for x.

12/20 = x/15

20x=12*15

20x = 180

x = 180/20

x =9

Is there another way to solve the above problem?

4. A Boeing 747 can carry up to 105 tons. What is the maximum weight in pounds if one tone is equivalent to 2000 pounds?

1ton:2000lbs

105tons*(2000lbs/1ton)

210,000 lbs

5.45 is what percent of 90?

45/90 = x/100

90x= 45*100

90x=4500

x=4500/90

x=50%

6. Miss John's favorite animal is the pig. If she collects 13 pig figurines in 4 years, then how many will she collect in 12 years?

13/4yr = x/12yrs

x=3*13 (or 4x=13*12,4x=156,x=156/4,x=39)

x=39 pigs

Thanks

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