Scholarship Exam Preparation App
Class 7 - (Math )
Operations on numbers - Ratio, proportion and variation. (time-work-speed)
If x and y are inversely proportional and y = 6 when x = 10, find the value of y when x = 12.
a :
5
b :
8
c :
4
d :
7.2
Explanation :
In inverse proportion, x × y is constant. So 10 × 6 = 60, hence 12 × y = 60, y = 5.