20 years ago father's age was 5 times that of his son. At present father's age is 10 years more than double the age of his son.
What were their ages 20 years ago?
a) 25 and 5
b) 30 and 6
c) 55 and 11
d) 50 and 10​

7.3

step-by-step explanation:

81+30=111180 minus 111=691/2×19=9.569÷9.5=7.263157895~7.3

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