Scholarship Exam Preparation App
Class 7 - (Math )
Operations on numbers - Ratio, proportion and variation. (time-work-speed)
If x is directly proportional to y and x = 15 when y = 25, then what is the value of x when y = 10?
a :
4
b :
8
c :
6
d :
12
Explanation :
The ratio x/y is constant in symmetry, so solving for 15 /25 = x/10 gets 6.