Question

If a:b =3:5 and a:c=5:7, what (c-a): (b+c) equal to​

Answer 1

Step-by-step explanation:

a:b=3:5

a/b=3/5

b=5a/3

and, a:c=5:7

a/c=5/7

c=7a/5

now, b:c=5a/3:7a/5

b/c=(5a/3)/(7a/5)

b/c=25/21

⇏ b:c=25:21

hope it helps

Answer 2

Answer:

a:b=3:5

a:b=3:5a/b=3/5

a:b=3:5a/b=3/5b=5a/3

a:b=3:5a/b=3/5b=5a/3and, a:c=5:7

a:b=3:5a/b=3/5b=5a/3and, a:c=5:7a/c=5/7

a:b=3:5a/b=3/5b=5a/3and, a:c=5:7a/c=5/7c=7a/5

a:b=3:5a/b=3/5b=5a/3and, a:c=5:7a/c=5/7c=7a/5now, b:c=5a/3:7a/5

a:b=3:5a/b=3/5b=5a/3and, a:c=5:7a/c=5/7c=7a/5now, b:c=5a/3:7a/5b/c=(5a/3)/(7a/5)

a:b=3:5a/b=3/5b=5a/3and, a:c=5:7a/c=5/7c=7a/5now, b:c=5a/3:7a/5b/c=(5a/3)/(7a/5)b/c=25/21

a:b=3:5a/b=3/5b=5a/3and, a:c=5:7a/c=5/7c=7a/5now, b:c=5a/3:7a/5b/c=(5a/3)/(7a/5)b/c=25/21⇏ b:c=25:21

Step-by-step explanation:

@MNF