When two chains are joined end to end, they are only as strong as the weaker of the two.

The chain

has the same strength as the chain

When two chains are joined side by side, they are as strong as the sum of the two.

The chain

has the same strength as the chain

What is the strength of the chain below?

\( 6\)\( 7\)\( 8\)\( 9\)\( 10\)