Question

4.
If a : b = c d = 3:5, then what are the values of ad : bc
a) 3:5
b) 5:3 c) 1:1 d) None of these​

Answer 1

Answer:

           1 : 1

Explanation:

a : b = c : d = 3 : 5

a / b = 3 / 5                                  c / d = 3 / 5

5×a / 3 = b                                    5×c / 3 = d

5a / 3 = b                                       5c / 3 = d

      ad : bc

= a × 5c / 3 : 5a / 3 × c

= 5ca / 3     :  5ca / 3

= 1 : 1

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