state gov WBPSC Food SI Mock Test 2023 Quantitative Aptitude Ratio and Proportion

The average of the age of a father and his son is 30 yr. Ten years ago, their age were in ratio of 3 : 1. The age ratio of father and son after 10 years will be ________.

1
3 : 1
2
4 : 2
3
5 : 3
4
6 : 4
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