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Ques:- Two years ago a man was 6 times as old as his son. After 18 years, he will be twice as old as his son. Their present ages ( in years) are
A. 31, 7
B. 32, 7
C. 34, 9
D. 36, 11
Ques:- Gold is 19 times as heavy as water and copper is 9 times. In what ratio should these metals be mixed so that the mixture may be 15 times as heavy as water?
A. 2 : 1
B. 3 : 2
C. 4 : 3
D. 5 : 4