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If 4:5::x : 45, then x= (a) 54 (b) ...

If `4:5::x : 45`, then `x=`
(a) 54
(b) 60
(c) 36
(d) 30

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RD SHARMA ENGLISH-RATIO, PROPORTION AND UNITARY METHOD-All Questions
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  3. If 4:5::x : 45, then x= (a) 54 (b) 60 (c) 36 (d) 30

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  18. Mean proportion of 2 and 8 is .................

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