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
Ques:- Find out the wrong number in the series:
64, 71, 80, 91, 104, 119, 135, 155
64, 71, 80, 91, 104, 119, 135, 155
A. 71
B. 80
C. 104
D. 135