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Given $x : y = 5$ : 6 and $y : z = 9$ : 10, find $x : z$ .

Competition practiceRatio, Proportion & Mixtures

A3:4
B4:3
C1:2
D5:6

Step-by-Step Solution

Make

y

equal (LCM 18):

x : y = 15

: 18 and

y : z = 18

: 20. So

x : z = 15 : 20 = 3 : 4

.

Answer: A) 3:4

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