If X:Y is 1:5 and Y:Z is 5:7 then X:Z is equal to
Choose the correct answer.
A) 1:6	B) 1:5	C) 1:4	D) 1:7	E) 1:3
The two ratios given are having the same number 5 for Y in both the ratios.   Hence- X:Y = 1:5 Y:Z = 5:7   =&gt; X:Z = 1:7   Answer 1:7
<result>D</result>
If X:Y is 1:5 and Y:Z is 5:7 then X:Z is equal to