Prospering students

There are girls and 30 boys in the class. Boys prospering 28, girls all. How many girls are in the class and how many boys are there, if all the prospering students are 95%?

Correct answer:

d =  10

Step-by-step explanation:

$$\begin{gathered} (28+d)\mathrm{/}(30+d)=0.95 \\ (28+d)=0.95\cdot (30+d) \\ 0.05d=0.5 \\ d=10 \end{gathered}$$

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