Here are the solutions to the problems: 16. Step 1: Let $M$ be the total amount of money. The problem states that $\frac{3}{4}$ of the money is $36000 \text{ frs}$. So, we can write the equation: $$\frac{3}{4} M = 36000$$ Step 2: Solve for $M$. Multiply both sides by $\frac{4}{3}$: $$M = 36000 \times \frac{4}{3}$$ $$M = \frac{36000 \times 4}{3}$$ $$M = 12000 \times 4$$ $$M = 48000$$ All of the money is worth $\boxed{48000 \text{ frs}}$. 17. Step 1: Identify the number to be rounded. The number is $3.256$. Step 2: Round to 3 significant figures. The first three significant figures are 3, 2, and 5. The digit after the third significant figure (5) is 6. Since $6 \ge 5$, we round up the third significant figure. So, 5 becomes 6. The number $3.256$ correct to 3 significant figures is $\boxed{3.26}$. 18. Step 1: Calculate the value of each term. $$8^2 = 8 \times 8 = 64$$ $$3^2 = 3 \times 3 = 9$$ $$2^2 = 2 \times 2 = 4$$ Step 2: Perform the subtraction. $$8^2 - 3^2 - 2^2 = 64 - 9 - 4$$ $$= 55 - 4$$ $$= 51$$ The value is $\boxed{51}$. 19. Step 1: Identify the principal amount ($P$), rate ($R$), and time ($T$). Principal ($P$) = $72000 \text{ frs}$ Rate ($R$) = $8\%$ per annum = $0.08$ Time ($T$) = $2 \text{ years}$ Step 2: Use the simple interest formula: $I = P \times R \times T$. $$I = 72000 \times 0.08 \times 2$$ $$I = 72000 \times 0.16$$ $$I = 11520$$ The simple interest is $\boxed{11520 \text{ frs}}$. 20. Step 1: Identify the diameter ($d$). Diameter ($d$) = $14 \text{ cm}$ Step 2: Use the formula for the circumference of a circle: $C = \pi d$. Using $\pi \approx \frac{22}{7}$: $$C = \frac{22}{7} \times 14$$ $$C = 22 \times 2$$ $$C = 44$$ The circumference is $\boxed{44 \text{ cm}}$. 21. Step 1: Write the decimal as a fraction. $$0.075 = \frac{75}{1000}$$ Step 2: Simplify the fraction to its lowest terms. Divide both the numerator and the denominator by their greatest common divisor. Both 75 and 1000 are divisible by 25. $$75 \div 25 = 3$$ $$1000 \div 25 = 40$$ So, the fraction in its lowest terms is $\frac{3}{40}$. $0.075$ as a fraction in its lowest term is $\boxed{\frac{3}{40}}$. 22. Step 1: Calculate the value of each term. $$8^2 = 8 \times 8 = 64$$ $$3^2 = 3 \times 3 = 9$$ Step 2: Multiply the results. $$8^2 \times 3^2 = 64 \times 9$$ $$= 576$$ The value is $\boxed{576}$. 23. Step 1: Identify the average and the number of values. Average of 3 numbers = 45 Number of values = 3 Step 2: Use the formula: Sum = Average $\times$ Number of values. $$\text{Sum} = 45 \times 3$$ $$\text{Sum} = 135$$ The sum of the three numbers is $\boxed{135}$. 24. Step 1: Identify the total volume and total price. Total volume of kerosene = $20 \text{ liters}$ Total price = $700 \text{ frs}$ Step 2: Calculate the price per liter. $$\text{Price per liter} = \frac{\text{Total price}}{\text{Total volume}}$$ $$= \frac{700 \text{ frs}}{20 \text{ liters}}$$ $$= 35 \text{ frs/liter}$$ The price per liter was $\boxed{35 \text{ frs}}$. 25. Step 1: Calculate the total fraction of salary spent. Spent on food = $\frac{3}{5}$ Spent on rent = $\frac{1}{10}$ Total spent = $\frac{3}{5} + \frac{1}{10}$ To add these fractions, find a common denominator, which is 10. $$\frac{3}{5} = \frac{3 \times 2}{5 \times 2} = \frac{6}{10}$$ Total spent = $\frac{6}{10} + \frac{1}{10} = \frac{7}{10}$ Step 2: Calculate the fraction left for other things. The whole salary is represented by 1. Fraction left = $1 - \text{Total spent}$ $$= 1 - \frac{7}{10}$$ $$= \frac{10}{10} - \frac{7}{10}$$ $$= \frac{3}{10}$$ The fraction left for other things is $\boxed{\frac{3}{10}}$. 26. Step 1: Identify the number. The number is $72,295$. Step 2: Write the number in words. The number is Seventy-two thousand, two hundred ninety-five. In words, 72,295 is $\boxed{\text{Seventy-two thousand, two hundred ninety-five}}$. 27. Step 1: Identify the number. The number is $2.503$. Step 2: Determine the place value of 5. In the number $2.503$: 2 is in the units place. 5 is in the tenths place. 0 is in the hundredths place. 3 is in the thousandths place. The value of 5 in the number is $\boxed{5 \text{ tenths}}$ or $\boxed{0.5}$. 28. Step 1: Identify the given values for the rectangular lawn. Perimeter ($P$) = $24 \text{ m}$ Length ($L$) = $4 \text{ m}$ Step 2: Use the formula for the perimeter of a rectangle: $P = 2(L + W)$, where $W$ is the width. $$24 = 2(4 + W)$$ Step 3: Solve for $W$. Divide both sides by 2: $$\frac{24}{2} = 4 + W$$ $$12 = 4 + W$$ Subtract 4 from both sides: $$W = 12 - 4$$ $$W = 8$$ The width of the lawn is $\boxed{8 \text{ m}}$. 29. Step 1: Add the numbers in base 10. $$23 + 42 = 65$$ Step 2: Convert the sum (65 in base 10) to base 5. Divide 65 by 5 repeatedly and record the remainders. $65 \div 5 = 13$ remainder $0$ $13 \div 5 = 2$ remainder $3$ $2 \div 5 = 0$ remainder $2$ Read the remainders from bottom to top: $230_5$. So, $23 + 42$ in base 5 is $\boxed{230_5}$. 30. Step 1: Identify Peter's birth year and the age he will be. Birth year = $1982$ Age = $37 \text{ years}$ Step 2: Add the age to the birth year to find the target year. $$\text{Year} = 1982 + 37$$ $$\text{Year} = 2019$$ Peter will be 37 years old in the year $\boxed{2019}$. That's 2 down. 3 left today — send the next one.