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Find the ratio of the following:
(a) 30 minutes to 1.5 hours
(b) 40 cm to 1.5 m
(c) 55 paise to Rs. 1
(d) 500 ml to 2 litres.
To do:
We have to find the ratios of :
(a) $30\ minutes$ to $1.5\ hours$
(b) $40\ cm$ to $1.5\ m$
(c) $55\ paise$ to $ Rs.\ 1 $
(d) $500\ ml$ to $2\ litres$.
Solution:
(a) We know that,
$1\ hour = 60\ minutes$
This implies,
$30\ minutes = \frac{30}{60}$
$= 0.5\ hours$
The ratio of $30\ minutes$ to $1.5\ hours$
$=\frac{0.5}{1.5}$
$=\frac{5}{15}$
$= \frac{1}{3}$
$=1:3$
The ratio of $30\ minutes$ to $1.5\ hours$ is $1:3$.
(b) We know that,
$1\ m = 100\ cm$
This implies,
$1.5\ m =1.5\times100\ cm$
$=150\ cm$
The ratio of $40\ cm$ to $1.5\ m$
$=\frac{40\ cm}{150\ cm}$
$= \frac{4}{15}$
$=4:15$
The ratio of $40\ cm$ to $1.5\ m$ is $4:15$.
(c) We know that,
$ 1\ Rs. = 100\ paise$
The ratio of $55\ paise$ to $ Rs.\ 1 $
$=\frac{55\ paise}{100\ paise}$
$=\frac{55}{100}$
$= \frac{11}{20}$
$=11:20$
The ratio of $55\ paise$ to $ Rs.\ 1 $ is $11:20$.
(d) We know that,
$1\ litre = 1000\ ml$
$2\ litres = 2\times1000\ ml$
$2\ litres = 2000\ ml$
The ratio of $500\ ml$ to $2\ litres$ is,
$=\frac{500\ ml}{2000\ ml}$
$= \frac{1}{4}$
$=1:4$
The ratio of $500\ ml$ to $2\ litres$ is $1:4$.