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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at first ,i had 20 cows,
1 of them ran away........................[left 19]
3 of them got robbed...........................[left 16]
2 1 of them fell sick....................[left 8]
i got an extra 7...............................................[left 15]
again,10 of them fell ill................................[left 5]
again i bought 15 more..............................[left 20]
60% of them ran away .........................[left 8]