Robbie loves playing fetch with his dog Spencer. Spencer always starts by sitting beside Robbie before Robbie throws the ball. When Robbie throws the ball, Spencer runs to it and brings the ball back to the same spot. Robbie throws the ball three times.
• The first time he throws it 8 metres.
• The second time he throws it twice as far as the first time.
• The third time he throws it 5 metres less than the second time.
How far does Spencer run in total?
(Remember that Spencer runs back and forth each time)
*Important - Show your complete solution, not just the answer. Explain how you got your answer in words and numbers!
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