One year ago the ratio of the ages of...

One year ago the ratio of the ages of Sarika and Gouri as 3:4 respectively. One year hence the ratio of their ages will be 10 :13 respectively. What is Sarika's present age? `18\ y e a r s` b. `20\ y e a r s` c. `26\ y e a r s` d. cannot be determine e. none of these

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