doubling

[mengta]

The cameras of the Voyager II spacecraft detected six small, previously unseen moons circling Uranus, doubling to twelve the number of satellites now known to orbit the distant planet.

can cameras "double" the number to twelve?
thanks

[mykwyner]

Before Voyager we only knew about six moons. The cameras of Voyager allowed us to find six more. The number of known moons doubled from 6 to 12.

[mengta]

so, is it correct that i say " the painting sold 500usd, doubling the price of the other one?"

thanks

[mykwyner]

Yes, that would be correct if the other painting sold for 250usd.