$\"\"$

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Brain has $\"\"$ more books than Erika.

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Let Erika has $\"\"$ number of books.

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Then,Brain has $\"\"$ and

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Jasmine has triple the number of books that brain has,

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Therefore, jasmine has $\"\"$ .

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Brain, Erika and Jasmine have $\"\"$ books.

\

Write the equation:

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Erika has plus Brain has plus Jasmine has equals Brain,Erika and

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$\"\"$ books $\"\"$ books $\"\"$ books Jasmine has $\"\"$ books

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$\"\"$

\

$\"\"$

\

Solve the equation.

\

$\"\"$ (Original equation)

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$\"\"$ (Simplify)

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$\"\"$ (Add common terms)

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$\"\"$ (Subtract $\"\"$ from each side)

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$\"\"$ (Apply additive inverse property : $\"\"$ )

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms)

\

Find the number of books has jasmine.

\

$\"\"$ (Substitute $\"\"$ in the equation)

\

$\"\"$ (Simplify)

\

Therefore, jasmine has $\"\"$ books.

\

$\"\"$

\

Jasmine has $\"\"$ books.