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In a mixture of three varities of tea , the ratio of their weights is `4:5:8`. If 5 kg tea of the first variety , 10 kg tea of the seconds variety are added to the mixture , the becomes as `5:7:9` .In the final mixture ,the quantity (in kg ) of the thrid variety of tea was ?

A

42

B

45

C

48

D

40

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The correct Answer is:
B
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