book Maths Puzzle Numerical Ability

Either perform the indicated operation or solve the equation, whichever is appropriate.


3/10 = 5/x

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book Other Question

I have a question concerning using quadratic equations to solve word problems.
Here is the question;
Find two positive numbers in the ratio 2:3 whose product is 2400.
I need to
The book is very vague about this. Find the common difference of the sequence in which the first term is 5 and the 11th term is -10. Any help appreciated.
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