(3551:53+3599:59)×400-15911=пжжж помогите

Question

(3551:53+3599:59)×400-15911=
пжжж помогите

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Answer 1

1)3551:53=67
2)3599:59=61
3)61+67=128
4)128•400=51200
5)51200-15911=35289