19. Find all the possible values of the missing digit(s) represented by \( (*) \) a) \( 2 * 6,8 * 71,8 * 919 \) are divisible by 11 .

Leon knows that his first four test grades were \( 92,91,85 \), and 95 . Use the formula \( \bar{x}=\frac{x_{1}+x_{2}+\ldots+x_{n}}{n} \) to find Leon's grade on the fifth test if his test average is 91.2 .

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... \( \begin{array}{ll}\text { a. } 15 \text { hari } 12 \text { hari } \\ \text { b. } 14 \text { hari } & \text { d. } 10 \text { hari }\end{array} \)

1. Ibu membutuhkan \( 2 \frac{1}{2} \) liter minyak goreng. Ibu mempunyai persediaan minyak goreng \( \frac{2}{3} \) liner. Jika ibu membeli minyak goreng sebanyak \( 1 \frac{1}{2} \) liter, maka minyak goreng yang harus dibeli ibu lagi adalah .... liter. \( \begin{array}{ll}\text { a. } \frac{1}{3} & \text { c. } 1 \\ \text { b. } \frac{2}{3} & \text { d. } 1 \frac{1}{3}\end{array} \)

20. Jumlah 20 suku pertama suatu deret aritmetika ialah 500. Jika suku pertama ialah 5 maka suku terakhir deret itu adalah A. 35 B. 39 C. 45 D. 48 E. 52

39. A grocer bought 20.5 kg of sugar at \( ₹ 14.60 \) per kg . if the sugar bought was in the packets of 250 g each, then how many packets of sugar did the grocer buy and how much did he pay for each packet?