Given the
ratios U:V = 9: 8 and V:W = 20:7 Find the ratio U:W.

__solution____U__=

__U__x

__V__

W V W

__U__=

__9__x

__20__

^{5}

W ~~8~~ 7

_{2}__U__=

__9 x 5__

W 2 x 7

__U__=

__45__

W 14

__Hence U:W = 45:14__

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Given the
ratios D:E = 5:7 and E:F = 3:15; Find
the ratio D:F.