Q316
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.
19 : 18
B.
9 : 8
C.
18 : 17
D.
19 : 17
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
\begin{array}{*{20}{c}}
{}&{{\text{A}}\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{B}}\,} \\
{{\text{Student}}}&{x - 5 = y + 5}
\end{array}