If x : y = 7 :9 and y : z = 15 : 7,find x : z
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Answer:
y
x
=
7
2
z
y
=
11
9
x=
7
2
yz=
4
11
y
x:y:z=
7
2
y:y:
9
11
y
=
7
2
:1:
9
11
=
7
2×63
:63:×
9
11
×63
=18:63:77
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