The present age of two persons are 42 and 81 years. If after n years the ratio of their ages will be 4: 7, then the value of n is |
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a) |
8 |
b) |
6 |
c) |
9 |
d) |
10 |

The present age of two persons are 42 and 81 years. If after n years the ratio of their ages will be 4: 7, then the value of n is |
|||||||

a) |
8 |
b) |
6 |
c) |
9 |
d) |
10 |

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