Question

a/b =4/5y ademas 4a +3b =186 cakcula a.b

Answer 1

a/b=4/5
4a+3b=186
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5a-4b=0
4a+3b=186
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15a-12b=0
16a+12b=744
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31a=744
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a=24
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5 x 24 - 4b = 0
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b=30
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a x b = 24 x 30 = 720