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The ratio of weight of Mr .Gupta and Mrs...

The ratio of weight of Mr .Gupta and Mrs .Gupta is `7:8` and their total weight is 120 kg .After taking the dieting course ,The weight of Mr Gupts is reduced by 6 kg and now the new ratio of their weight became `5:6` . By what amount Mrs . Gupta 's weight got reduced ?

A

2 kg

B

4 kg

C

3 kg

D

5 kg

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