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The question appears to be describing three resistors all in parallel.

The reciprocal of their net effective resistance is

(1/20) + (1/20) + (1/10) = (2/20) + (1/10) = (1/10) + (1/10) = (2/10) = 1/5.

The net effective resistance is [ 1 / (1/5) ] = 5 ohms.

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