book Maths Puzzle Numerical Ability

Find A, when a=7 and b=12.

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book Other Question

Can someone help me?
I need to write the proportion that is equivalent to the given statement:
If Maria hit 8 home runs in 15 softball games, then she should hit 24 home runs in 45 games.

Thank you!
Lyn Is there anyone who can explain what this equation is and how to calculate it?
I just found it on the web and I know nothing about it. But I do think that:
t=time
j=cycle