The ratio of a radio of two wheel is 5:7 find the ratio Give me full formula
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ratio of
a
to
b
is
5
:
7
, which means
a
b
=
5
7
Substituting the value of
b
from eq. 1:
a
12
+
a
=
5
7
Cross multiply.
7
a
=
60
+
5
a
7
a
−
5
a
=
60
2
a
=
60
2
a
2
=
60
2
a
=
30
b
=
12
+
a
b
=
12
+
30
b
=
42
Check:
Is
5
7
=
30
42
?
Cross multiply.
210
=
210
a
to
b
is
5
:
7
, which means
a
b
=
5
7
Substituting the value of
b
from eq. 1:
a
12
+
a
=
5
7
Cross multiply.
7
a
=
60
+
5
a
7
a
−
5
a
=
60
2
a
=
60
2
a
2
=
60
2
a
=
30
b
=
12
+
a
b
=
12
+
30
b
=
42
Check:
Is
5
7
=
30
42
?
Cross multiply.
210
=
210
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