a =12
Answer:
Since
a
b
=
c
d
,
we can use an algebraic technique, to get the value of
a
, by isolation and using the golden rule of algebra, "Balancing the equation"
a
40
=
3
10
to isolate
a
, we must eliminate
40
in the left side of the equation by multiplying it by
40
, the golden rule of algebra states that whatever you do in a side of an equation is you also must do it in the other side to keep the equation balanced.
(
40
)
a
40
=
3
10
(
40
)
40
a
40
=
(
40
)
(
3
)
10
a
=
120
10
, we can still simplify the answer giving,