Question

MATH??? HELP?! ASAP!

(Please explain to me how did you got the answer)

Answer 1

which ratio forms a proportion with 20/30? use equivalent ratios to test each ratio.

A: 16/24
B: 10/20
C: 17/51
D: 15/60

Answer 2

If you're not too good with fractions to figure out the ratio , try simplifying all of them

Answer 3

Which ratios form a proportion? Use cross products to test each pair.
A: 15/40, 35/90
B: 18/22, 45/55
C: 12/55, 33/121
D: 17/31, 32/45

Answer 4

which ratios form a proportion? Use cross products to test each pair.
A: 9/17, 27/50
B: 12/35, 24/75
C: 15/55, 33/121
D: 12/35, 20/70

Answer 5

which ratios do NOT form a proportion?

A: 24/96, 27/108
B: 17/102, 12/70
C: 21/51, 35/85
D: 45/75, 63/105

Answer 6

The ratios have to be the same to be a proportion. If you want to be able to compare the ratios, the fractions have to have the same denominator.
so 1/2 = 3/6 because 3/6 can be reduced to equal 1/2. 1/2 and 3/6 form a proportion.
For the question at the very top, 20/30 reduces to 2/3.
I divided top and bottom by 10 to get 2/3.

In 'A', 16/24 also reduces to 2/3. Divide top and bottom by 8 to get 2/3.
So A is the answer for the first one.
Do you understand how to do the other questions now?