3. m directly proportional n, n = 15 when m = 25. Hence
(1) Find m when n = 87 (2) Find n when m = 155
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Answer:
m/n =5/3
when n= 87
m/87= 5/3
m= 5×9=45
when m=155
155/n=5/3
n=31×3=93
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