Grades 1-2 Video Solutions 2025-2025_1-2

Video Transcription

Problem number 12. A dog has two puppies that weigh the same. The first picture shows that the dog and one puppy together weigh 14 kg.  The second picture shows that the dog and both puppies together weigh 18 kg. How much does the dog weigh?  We can notice that the difference between the two pictures is that on the scales, there is an additional puppy in the second picture, and the actual weights differ by 4 kg.  Since these are the only two differences between the pictures, that means that one puppy must be the cause of this difference, that is, one puppy weighs 4 kg.  Now, let's look at the first scale. We note that a dog and one puppy weigh 14 kg together.  To figure out the weight of the dog, we can subtract out the weight of the puppy. The dog weighs 14 kg minus 4 kg equals 10 kg. That means that the answer is B, 10 kg.

Video Summary

Problem number 12. A dog has two puppies that weigh the same. The first picture shows that the dog and one puppy together weigh 14 kg. The second picture shows that the dog and both puppies together weigh 18 kg. How much does the dog weigh? We can notice that the difference between the two pictures is that on the scales, there is an additional puppy in the second picture, and the actual weights differ by 4 kg. Since these are the only two differences between the pictures, that means that one puppy must be the cause of this difference, that is, one puppy weighs 4 kg. Now, let's look at the first scale. We note that a dog and one puppy weigh 14 kg together. To figure out the weight of the dog, we can subtract out the weight of the puppy. The dog weighs 14 kg minus 4 kg equals 10 kg. That means that the answer is B, 10 kg.

Keywords

dog

puppies

weight

problem-solving

math