The difference between the fractions 5 minutes of an hour and 20 seconds of an hour is:
\( \frac{0.7}{9} \)
\( \frac{7}{12} \)
\( \frac{16}{180} \)
\( \frac{28}{270} \)
In a school the ratio of the number of boys and girls is 5:6. 20% boys and 25% girls are scholarship holders. How many students did not get a scholarship?
\( \frac{750}{11} \)%
\( \frac{950}{11} \)%
\( \frac{850}{11} \)%
\( \frac{8000}{11} \)%
The area of triangle ABC is 39 cm². D and E are two points on BC such that BD = DE = EC, then what is the area of triangle ADC?