the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.
Answer from: Quest
This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.
Answer from: Quest
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