Q103
The time spent to study history and chemistry is 4 hours 30 minutes, Then the student studies physics for:
A.
1 hours 30 min
B.
2.9 hour (approx.)
C.
2 hours
D.
3 hours
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
\begin{aligned}
& \text{Time spend in H + C} \\
& = \left(15 + 15 \right)\% \\
& = 30\% \\
& \text{Time spend in P = 20%} \\
& \because 30\% = 4\frac{1}{2} \text{H} = \frac{9}{2}\text{H} \\
& 1\% = \frac{9}{2} \times 30\text{H} \\
& \text{So, } 20\% = \frac{9}{2} \times \frac{20}{30}\text{H} = 3\text{ Hours} \\
& \text{So } 20\% = \frac{3}{20} \times 20 = 3\text{ Hours} \\\end{aligned}