If 2.8, 7, 12 and x are in proportion then x = ………………..
If 2.8, 7, 12 and x are in proportion then x = ………………..
A) 20
B) 31
C) 30
D) 40
4 views
2 Answers
Correct option is (C) 30
Given that 2.8, 7, 12 and x are in proportion.
\(\therefore\) 2.8 : 7 = 12 : x
\(\Rightarrow\) \(\frac{2.8}7=\frac{12}x\)
\(\Rightarrow\) \(x=12\times\frac7{2.8}=\frac{12}{0.4}=\frac{120}4\) = 30
4 views
Answered