Cows

Algebra Level 1

If I had 20 cows, and one of them ran away, and then another 3 got robbed, then a further 1/2 of them fell sick, but I got an extra 7 cows from a friend, then 10 of them fell ill, so I went and bought 15 more, and then finally 60% of them ran away, how many are left?

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