3 years ago

Seven cakes cost £2.10 how much do ten cakes cost

1 answer:

max2010maxim [7]3 years ago

3 0

$\begin{array}{ccc}7\ cakes&-&\£2.10\\\\10\ cakes&-&x\end{array}\ \ \ |cross\ multiply\\\\7\cdot x=10\cdot\ \£2.10\\\\7x=\£21.00\ \ \ \ |divide\ both\ sides\ by\ 7\\\\\boxed{x=\£3.00}\leftarrow answer$

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