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Question

Write each of the following ratios in the simplest form:
(i) Rs 6.30:Rs. 16.80
(ii) 3 weeks :30 days
(iii) 3 m 5 cm :35 cm
(iv) 48 min :2 hours 40 min
(v) 1 L 35 mL :270 mL
(vi) 4 kg :2 kg 500 g

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Solution

(i) Rs. 6.30:Rs. 16.80

6.3016.80=63168=63÷21168÷21=38 (H.C.F. of 63 and 168 is 21.)

Ratio in simplest form =3:8

(ii) 3 weeks :30 days =21 days :30 days (1 week =7 days)

2130=21÷330÷3=710 (H.C.F. of 21 and 30 is 3.)
Ratio in simplest form =7:10

(iii) 3 m 5 cm:35 cm=305 cm:35 cm (1 m=100 cm)

30535=305÷535÷5=617 (H.C.F. of 305 and 35 is 5.)

Ratio in simplest form =61:7

(iv) 48 min :2 hours 40 min =48 min :160 min (1 hour =60 mins)

48160=48÷16160÷16=310 (H.C.F. of 48 and 160 is 16.)

Ratio in the simplest form =3:10

(v) 1 L 35 mL :270 mL =1035 mL :270 mL (1 L =1000 mL)

1035270=1035÷45270÷45=236 (H.C.F. of 1035 and 270 is 45.)

Ratio in the simplest form =23:6

(vi) 4 kg :2 kg 500 g =4000 g :2500 g (1 kg =1000 g)

40002500=4025=40÷525÷5=85 (H.C.F. of 40 and 25 is 5.)

Ratio in the simples form =8:5


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