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Nutka1998 [239]
3 years ago
10

1. Which ratios form a proportion? a. 4/9, 12 / 25 b. 3 / 7, 18 / 42 c. 5/11, 20/45 d. 5/8, 15/25. 2. Which ratio forms a propor

tion with 18 over 30? a. 20 / 35 b. 50 / 90 c. 36 / 48 d. 60 / 100. 3. Which proportion has cross products of 5 × 24 and 8 × 15? a. 5/8=15/24 b. 5/24=8/15 c 8/24=15/5 d 15/8=5/24
Mathematics
2 answers:
Tamiku [17]3 years ago
8 0

Answer:

Part 1) 3/7,18/42

Part 2)  60/100

Part 3) 5/8=15/24

Step-by-step explanation:

we know that

If two ratios form a proportion, then the two ratios in simplest form are equal

Part 1

Which ratios form a proportion?

<u>case A)</u> 4/9,12/25

equate the ratios

4/9=12/25\\4*25=12*9

100\neq 108 ------> is not true

therefore

the ratios case A does not form a proportion

<u>case B)</u> 3/7,18/42

equate the ratios

3/7=18/42\\3*42=7*18

126=126 ------> is true

therefore

the ratios case B  form a proportion

<u>case C)</u> 5/11,20/45

equate the ratios

5/11=20/45\\5*45=20*11

225\neq220 ------> is not true

therefore

the ratios case C does not form a proportion

<u>case D)</u> 5/8,15/25

equate the ratios

5/8=15/25\\5*25=15*8

125\neq120 ------> is not true

therefore

the ratios case D does not form a proportion

Part 2

Which ratio forms a proportion with 18 over 30?

<u>case A)</u> 20/35

equate the ratio to  18/30

20/35=18/30\\20*30=35*18

600\neq 630 ------> is not true

therefore

the ratio case A does not form a proportion with 18/30

<u>case B)</u> 50/90

equate the ratio to  18/30

50/90=18/30\\50*30=90*18

1,500\neq 1,620 ------> is not true

therefore

the ratio case B does not form a proportion with 18/30

<u>case C)</u> 36/48

equate the ratio to  18/30

36/48=18/30\\36*30=48*18

1,080\neq 864 ------> is not true

therefore

the ratio case C does not form a proportion with 18/30

<u>case D)</u> 60/100

equate the ratio to  18/30

60/100=18/30\\60*30=100*18

1,800=1,800 ------> is true

therefore

the ratio case D  form a proportion with 18/30

Part 3

Which proportion has cross products of 5 × 24 and 8 × 15?

<u>case A)</u> 5/8=15/24

the cross product is equal to

5*24=8*15

therefore

the proportion case A is a solution

<u>case B)</u> 5/24=8/15

the cross product is equal to

5*15=24*8

therefore

the proportion case B is not a solution

<u>case C)</u> 8/24=15/5

the cross product is equal to

8*5=24*15

therefore

the proportion case C is not a solution

<u>case D)</u> 15/8=5/24

the cross product is equal to

15*24=8*5

therefore

the proportion case D is not a solution

harkovskaia [24]3 years ago
4 0
I am pretty sure that the right answer for the first question which is being asked is the second option - <span><span>b. 3 / 7, 18 / 42
</span>What about the next one, I bet it's </span> d. 60 / 100. 3
And the last one is  a. 5/8=15/24 
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Hi there!

Let's start by replacing "a number" by the letter "x" so that we can do an equation and isolate "x" to find your answer :

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