Question

If 7a + 3b : 4a + 9b = 9:7 then the value of
$\frac{a + b}{a}$
is _________.
A.
$\frac{53}{60}$
B.
$\frac{73}{70}$
C.
$\frac{73}{60}$

D.
$\frac{53}{70}$
Step by step Explanations please​

Answer 1

Answer:

The value of (a+b)/a =

73/60

Option (c) is correct.

7a + 3b / 4a + 9b = 9/7

Now simply the equation

49a + 21b = 36a + 81b

:

49a -36a81b -21b

13a = 60b

b/a = 13/60

a = 60

Then (a + b)/a

Now put the value of a in above equation

(60+13)/60= 73/60

Thus the value of (a+b)/a = 73/60

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Answer 2

Answer:

Step-by-step explanation: