A teacher always arranged the content of each of her lessons as teaching and practising skills in the ratio 3:4
1)if the teaching lasted 15 minutes. How long did the practising last?
2) if she decided to teach for 30 min. How long would the lesson last?
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Step-by-step explanation:
1). 20 min
as 3:4 = 15:20
2)70 min
as 3:4 = 30:40
30+40 = teaching + practising = total class time
70 minutes
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