Using ratio plz help im stuck i need #5 for one side 1-5 for the other

1) Muriel’s scores for science, math and English are in the ratio of 3:5:7. If her highest score was 21, find the difference between the highest and lowest score.

Science= 3 * 21 = 63
Math= 5 * 21 = 105
English= 7 * 21 = 147

147- 63 = 84

84
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2) A rope is cut in two in the ratio 3.5:1.75. The difference between the length is 94.5 inches. What was the original length of the rope?

3.5+1.75= 5.25
94.5 + 5.25 = 99.75

99.75
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3) A room is 14 feet long. Find the width of the room, if the ratio of the length to the width of the room is 7:5.
Length= 14
7 • 2 = 14
5 • 2 = 10

10 feet
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4) Steve covers a distance of 0.7 miles in 2 minutes. How much time will it take to travel 14 miles?
0.7 miles in 2 minutes
2 • 7 = 14
0.7 • 7 = 4.9

4.9 miles
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5) Lara and Mae are collecting seashells. For every 9 seashells that Lara picked, Mar gathered 7 seashells. If Lara collected 63 seashells, how many fewer seashells did Mae gather?

Let’s get out the key words here.
Lara gathers 9
Mae gathers 7
Lara collects 63
Mae collects ?
**Fewer seashells**

9 • ? = 63
9 • 7 = 63
This means she would need to gather 9 seashells 7 times to get 63 seashells.
This means Mae would need to get 7 shells 7 times to get her fewer amount.

7 • 7 = 49

Mae would gather 49 seashells. But it says fewer seashells.
63- 49 = 14

Final Mae would gather 14 less seashells then Lara.
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5) A sum of 2,700 is shared among Eric, Jo, and Richard. Jo’s share is two times that of Richard’s share. Eric’s share is three times that of Jo’s share. Find Eric’s share.

2700/3= 900
900*2= $1,800

$1,800
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I’m not sure if all of the answers are right but I hope this still helps you :)