Which of the following expressions will yield o negative number? a.) \( (-20)(-5) \) b.) \( -18 \div(-2) \) c.) \( (-1)(9) \) d.) \( (6)(8) \)

\( 66 \frac{2}{3} \% \) of 60 kg

number of girls is \( 9: 7 \). Find the number of boys if the total number of students is 3200 . 19. The sides of a triangle are in the ratio of \( 2: 3: 4 \). If the perimeter is 72 cm , find its sides. 20. In a factory the ratio of number of defective bolts produced to the number of good bulbs is \( 1: 10 \). In one hour the factory produced 330 bolts. Find the number of defective bulbs produced by the

6. Find the LCM of 12 and 15 . 7. Calculate the HCF of 36 and 60 by continue division method. 8. Convert \( 35^{\circ} \mathrm{C} \) into degree Fahrenheit. 9. Change \( 94^{\circ} \mathrm{F} \) into Celsius scale. 10. Find the complement angle of \( 47^{\circ} \) and supplement angle of \( 120^{\circ} \).

A car driving in fog passed a man walking at \( 3 \mathrm{~km} / \mathrm{hr} \) in the same direction. He could see the car for 4 minutes and upto a distance of 100 m . What was the speed of the car? \( \begin{array}{llll}\text { 1) } 4.5 \mathrm{~km} / \mathrm{hr} & \text { 2) } 3.5 \mathrm{~km} / \mathrm{hr} & \text { 3) } 5.5 \mathrm{~km} / \mathrm{hr} & \text { 4) } 6 \mathrm{~km} / \mathrm{hr}\end{array} \)

1. Write the place value of 3 in 359. 2. Give one like fraction of \( \frac{2}{3}, \frac{9}{3} \) 3. The SI unit of length is 4. How many years are there in a century? 5. Full form of CCE is