Question

show weather 5kg : 750g and Rs 7.5: Rs 5 are in proportion

Answer 1

no they are not in a same proportion.

Answer 2

Given ratio are 5kg:750g = 5000g:750g 
This can be written as 5000/750
Another ratio = 7.5: 5 = 7.5/5
If they are in proportion then 
5000/750 = 7.5/5
⇒500/75 = 7.5/5
⇒500× 5 = 7.5 ×75
⇒2500 = 562.5
Since we did not get equal values on both the sides the ratios are not in proportion