3. Disebuah peternakan, 6 ekor sapi dapat menghabiskan persediaan pakan selama 25 hari. Jika diasumsikan persediaan pakan sama, maka jika terdapat 15 ekor sapi berapa lama persediaan pakan akan habis... \( \begin{array}{ll}\text { a. } 15 \text { hari } 12 \text { hari } \\ \text { b. } 14 \text { hari } & \text { d. } 10 \text { hari }\end{array} \)

7. \( \left(\frac{1}{2}+\frac{3}{20}\right)-\frac{2}{20} \)

(i) \( \frac{-7}{21} \) and \( \frac{3}{9} \)

A lab technician is dividing a cell that has a diameter of \( 4.32 \times 10^{-4} \) millinijeters. Each of the new cells has a diameter measuring exactly one half of the diameter of the original cell. Which is the diameter of a new cell?

За 14 дней 9 рабочих выпол- нили \( \frac{7}{12} \) задания. Сколько рабочих необходимо нанять дополнительно, чтобы вы- полнить оставшуюся часть задания за 6 дней? (4)

3. What is the place value of 7 in the number 67328