Elementary Math Word Problems

The total number of sacks is found by multiplying the number of rows by the number of items per row: 3 * 7 = 21. 12, 14, and 27 are incorrect products of these two integers.

Doubling a number means multiplying it by 2. 80 x 2 = 160. Option B is correct. 120 is 80 + 40 (not double), 220 is 80 x 2.75, and 140 is 80 + 60.

If half of the journey is 9 km, the full journey is 9 km * 2 = 18 km. Option 347367 is incorrect because it uses 'miles' instead of 'km', and the other options are incorrect multiples.

Adding 59 to 8: 59 + 8 = 67. When adding 8 to 59, the 8 adds to the 9 to make 17, which carries 1 to the tens place, making 67. Option D is correct. 66 is 59 + 7, 68 is 59 + 9, and 77 is 59 + 18.

The sequence follows a pattern of adding 12 to the previous number: 21+12=33, 33+12=45, 45+12=57. Therefore, 57+12=69. The other options do not follow this constant arithmetic progression.

A typical apple weighs approximately 100 to 200 grams. 100 kg is the weight of a large animal, while cm and mm are units of length, not mass, making them invalid choices for weight.

To find the number of girls, subtract the number of boys from the total number of children: 35 - 16 = 19. The other options are incorrect subtractions (e.g., 35-16 is not 17 or 18).

Sharing 35 biscuits among 7 children requires division: 35 / 7 = 5. Each child receives 5 biscuits. Other options like 6, 7, or 9 do not satisfy the equation 7 * x = 35.

To find the total number of students, multiply the number of buses by the students per bus: 16 * 42 = 672. 58 is the sum (16+42), and the other options are incorrect multiplication results.

The cost of books is 5 * $7.95 = $39.75. The cost of tapes is 8 * $10.25 = $82.00. Adding these together ($39.75 + $82.00) gives a total of $121.75. Option 347818 is slightly off due to a calculation error.

Total time spent is 45 min (English) + 35 min (Math) + 75 min (History) = 155 minutes. 155 minutes is 2 hours and 35 minutes. Adding 2:35 to the 5:00 PM start time results in a finish time of 7:35 PM.

To find the number of students with red hair, we need to subtract the percentage of students with brown hair and black hair from 100% (since these two groups make up the majority of the students).

Let's calculate the number of students with brown hair first.
34% of 80 students is (34/100) * 80 = 27.2 students. Since we can't have a fraction of a student, we round it to the nearest whole number. So, there are approximately 27 students with brown hair.

Next, let's calculate the number of students with black hair.
61% of 80 students is (61/100) * 80 = 48.8 students. Again, rounding it to the nearest whole number, we have approximately 49 students with black hair.

Now, let's subtract the total number of students with brown and black hair from the total number of students to find the number of students with red hair.
Total students = 80
Students with brown hair = 27
Students with black hair = 49

Students with red hair = Total students - (Students with brown hair + Students with black hair)
Students with red hair = 80 - (27 + 49) = 80 - 76 = 4

Therefore, the correct answer is B. 4 students have red hair.

To find the total number of chairs, multiply the chairs per row by the number of rows: 24 x 16 = 384. This is a straightforward multiplication problem requiring the understanding that area calculation involves multiplying length by width (or rows by columns).

Jasmine moves 6 forward and 3 back, ending at space 3 (6 - 3 = 3). Jeremy moves 4 spaces forward, ending at space 4. The distance between them is the difference between their positions: 4 - 3 = 1 space.

Calculate the cost for each item separately and then add: Pens = 12 x $8.50 = $102; Pencils = 12 x $6.00 = $72; Total = $102 + $72 = $174. This requires performing two multiplication problems and then adding the results.

To find the length of each piece, divide the total length by the number of pieces: 144 inches / 6 = 24 inches. The other options are incorrect mathematical results of the division (e.g., 144/12=12 or 144/8=18).