1. Calculate Monday's total expenses: $23.50 (office supplies) + $45.75 (utilities) = $69.25. 2. Calculate Tuesday's total expenses: Tuesday's expenses were double Monday's total, so $69.25 * 2 = $138.50. 3. Calculate the total expenditure for both days: $69.25 (Monday) + $138.50 (Tuesday) = $207.75. Why others are wrong: A — This amount represents only Tuesday's total expenditure, not the combined total for both days. B — Correct answer. C — This result would occur if there was a calculation error when doubling Monday's expenses (e.g., $69.25 * 2 = $128.50 instead of $138.50), leading to $69.25 + $128.50 = $197.75. D — This result would occur if there was a calculation error when summing Monday's initial expenses (e.g., $23.50 + $45.75 = $68.25 instead of $69.25), leading to a subsequent incorrect total for both days ($68.25 + ($68.25 * 2) = $68.25 + $136.50 = $204.75).

1. Calculate the total amount of flour initially used: 1.2 kg (for cake) + 0.35 kg (for muffins) = 1.55 kg. 2. Subtract this amount from the initial flour stock: 2.75 kg - 1.55 kg = 1.2 kg. 3. The baker then uses an additional 0.125 kg of flour, which is also taken from his stock. 4. Subtract this additional amount from the current remaining stock: 1.2 kg - 0.125 kg = 1.075 kg. 5. Therefore, the baker has 1.075 kg of flour left. Why others are wrong: B — This would be the amount left if the additional 0.125 kg of flour was not taken from the stock. C — This results from incorrectly adding the final 0.125 kg to the remaining stock instead of subtracting it. D — This is the total amount of flour used in all operations, not the amount remaining.

First, sum the weights of the dry ingredients: 0.75 kg (flour) + 0.20 kg (sugar) + 0.05 kg (cocoa powder) = 1.00 kg. Next, add the weight of the butter to the sum of the dry ingredients: 1.00 kg (dry ingredients) + 0.35 kg (butter) = 1.35 kg. The total weight of the ingredients is 1.35 kg. Why others are wrong: A — This result could occur if 0.25 kg of butter was mistakenly added instead of 0.35 kg. B — Correct answer. C — This result could occur if an extra 0.1 kg was incorrectly added, or if 0.05 kg was misread as 0.15 kg. D — This result could occur from miscalculations, such as misreading 0.2 kg as 0.4 kg.

First, calculate the total amount of flour used: Flour used on Monday: 3.75 kg Flour used on Tuesday: 4.20 kg (aligning decimal places for addition) Total flour used = 3.75 + 4.20 = 7.95 kg Next, subtract the total flour used from the initial amount of flour: Initial flour: 12.50 kg (aligning decimal places for subtraction) Total flour used: 7.95 kg Flour remaining = 12.50 - 7.95 = 4.55 kg Why others are wrong: A — Correct calculation. B — This is the total amount of flour used, not the amount remaining. C — This result occurs if only the flour used on Monday (3.75 kg) is subtracted from the initial amount (12.5 - 3.75 = 8.75), ignoring the flour used on Tuesday. D — This result occurs if there was an error in calculating the total flour used, for example, if 3.75 + 4.2 was incorrectly calculated as 7.75 (instead of 7.95), leading to 12.5 - 7.75 = 4.75.

Calculate the cost of apples: 2.5 kg * $3.20/kg = $8.00 Calculate the cost of bananas: 1.5 kg * $1.80/kg = $2.70 Calculate the total cost of groceries: $8.00 + $2.70 = $10.70 Calculate the change from a $20.00 bill: $20.00 - $10.70 = $9.30 Why others are wrong: A — This is the correct amount of change. B — This option represents the total cost of the groceries, not the change received. C — This option results from an error in calculating the banana cost as $3.30 ($1.5 \times $1.80 is incorrectly calculated as $3.30 instead of $2.70), leading to a total of $11.30, and then $20.00 - $11.30 = $8.70. D — This option results from a common subtraction error when calculating $20.00 - $10.70 (e.g., subtracting 0.7 from 0.0 directly without borrowing, leading to an incorrect difference of $10.30).