1.

When 5 children from class A join class B, the number of children in both classes is the same. If 25 children from B, join A, then the number of children in A becomes double the number of children in B. The ratio of the number of children in A to those in B is:

A. 9 : 8
B. 19 : 18
C. 19 : 17
D. 18 : 17
Answer» D. 18 : 17


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