Question

Rui Feng is 1.68m tall and his younger brother is 105cm long find the ratio of

i) Rui Feng height to his brother height
ii)Rui Feng height to the total height of both boys

Answer 1

8 : 5 , 8 : 13

Explanation:

the parts of the ratio must be of the same units of measure

using the conversion

1 m = 100 cm , then

1.68 m = 1.68 × 100 = 168 cm

(i)

ratio of

Rui Feng : brother

= 168 : 105 ( divide both parts by 21 , the LCM of both )

= 8 : 5

(ii)

ratio of

Rui Feng : total

= 168 : 168 + 105

= 168 : 273 ( divide both parts by 21 , the LCM of both )

= 8 : 13