What is the value of x, if x% of 142 + 30% of 280 = 368?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 200
The known part, 30% of 280, is worked out first; what is left of 368 is x% of 142.
30% of 280 \(\displaystyle =\frac{30}{100}\times280=84\)
x% of 142 \(=368-84=284\)
\(\displaystyle \frac{x}{100}\times142=284\)
\(\displaystyle x=\frac{284\times100}{142}=200\)