exam Maths Puzzle Numerical Ability

hello please help me i dont understand this proof im confused thanks alot i appreciate it

u need the book to solve it

its Problem number 20 on page 138

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exam Other Question

Last year Veronica made $930 in interest from her two savings accounts, with one invested at 6% per year and with the other account invested at 9%. This year her rates dropped to 4 explain to me how you solve x+3/2=15