Guess the Weight of These Sheep to win a Helicopter Ride.

Guess the combined weight, on the day, of two live sheep, which you can view, but not touch, and win this fantastic prize. FREE ENTRY Only one prize. Only one winner.

To help you, we have included a sheep-calculation diagram, but only part of it. The rest is up to you. Solve this, and you could qualify for a job at GCHQ.