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The statement: " Fourth multiple of a and d is a Prime number" is incorrect.

Fourth multiple of a = 4 x a which means the number(prime number) is divisible by 4 and a but a prime number is divisible by only 1 and itself but here the prime number(according to question) is divisible by 4 which is incorrect.

Q: What are the values of a b c and d if a is a factor of b c equals 2b c equals 4a and d is a prime number between 10 and 20 and all numbers are different and add up to?

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That's a factor pair.

You look for a common factor between the two numbers; then you divide both numbers by this factor.

80 has 5 factor pairs.

It implies b is a factor of a.

Not a lot. They're both prime numbers. A factor that is prime is used to make other numbers.

Related questions

To find out the difference between prime numbers and composite numbers because prime numbers are useful in finding the lowest common multiple of numbers or the highest common factor of numbers.

The least common factor of any set of numbers is 1.

Factors go into numbers, numbers go into multiples.

That's a factor pair.

356

56 and 64 are some options...

Yes, the greatest common factor of two different prime numbers is always 1

You look for a common factor between the two numbers; then you divide both numbers by this factor.

Bigger numbers make bigger factor trees, and of course there are prime numbers which cant be factored at all

Factors go into numbers, numbers go into multiples.

Factors go into numbers, numbers go into multiples.

Factors go into numbers, numbers go into multiples.