please mathematics aryabhatta solve this math
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(1) 6/10=15/a
6×a=15×10
a=150/6
a=25
6/10=b/47.5
b×10=47.5×6
b=47.5×6/10
b=28.5
6/10=21/c
c×6=10×21
c=210/6
c=35
(2) 8/20=a/17.5
a×20=8×17.5
a=8×17.5/20
a=7.5
8/20=6/b
b×8=20×6
b=20×6/8
b=15
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