Question

Which ratios form a proportion? (1 point)
4/9, 12 / 25
3 / 7, 18 / 42
5/11, 20/45
5/8, 15/25
2. Which ratio forms a proportion with 18 over 30? (1 point)
20 / 35
50 / 90
36 / 48
60 / 100
3. Which proportion has cross products of 5 × 24 and 8 × 15? (1 point)
a 5/8=15/24
b 5/24=8/15
c 8/24=15/5
d 15/8=5/24

Answer 1

For question one just see which ratio pair differ by a common multiple. We can see that B is the correct answer.

For question two do the same thing however you want to equate each answer ratio to 18/30 and see if any differ by simply a factor of something. We can see that the answer is D.

For question three cross products are simply the denominator of ratio A and the Numerator for ratio B multiplied and the same for the second pair of numbers left seeing that we can see that A is the correct answer to the question.

Answer 2

Thank you so much for answering with explanation , you didn't give me straight answer but explained it as well :)

Answer 3

Please can you explain more how you picked the answer for question 2

Answer 4

You simply want to see what ratio of the provided answers is equivalent to 18/30. So the setup should be like this: \[\frac{ 18 }{30 }=\frac{ x }{ y }....18y=30x....\] Or you can just use the answers to see which one will simplify to the simpliest form of each which is answer D. Both Reduce down to \[\frac{ 3 }{ 5 }\]

Answer 5

thanks got it :)