A:B=4:5, B:C=7:9, C:D=3:4. A's share is 1680. Find share of D
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a×b×c÷b×c×d=a:d
4×7×3÷5×9×4=7:15
a:d=7:15
a= 1680
d=1680×15÷7=3600
d=3600
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