x : y = 3 : 5, find the ratio 8x + 4y : 8x + 5y
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let x=3A,
y=5A,
then
8x+4y : 8x+5y,
8×3A+4×5A : 8×3A+5×5A,
24A+20A : 24A+25A,
44A : 49A,
44 : 49
y=5A,
then
8x+4y : 8x+5y,
8×3A+4×5A : 8×3A+5×5A,
24A+20A : 24A+25A,
44A : 49A,
44 : 49
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