Respuesta :

Answer:  15

Step-by-step explanation:

The ratio 3 : 4 represents the younger brother : older brother

3 + 4 = 7

Since we want a total of 35, multiply each value in the ratio by 5:

 3 : 4  = 7

x5 x5  x5

15 : 20 = 35

So the younger brother had 15 oranges

and the older brother had 20 oranges

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