Thailand 1st Elementary Mathematics International Contest

Below is one of Mathematics Contest in Thailand. Please read carefully, then answer correctly.

Peter bearing 144 books and donated to the 4 schools. When Peter checks the books donated to the school, he saw that the difference in the number of books received by the school A and school B is 4, the difference in the number of books received by school B and school C is 3 and the difference in the number of books received is 2. School A receives at most, but less than 40 books.
a. How many ways Peter can donate books to school to school B and D?
b. How many books are accepted by the school each school B and D?

Solution:
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Degre

Find the value of xo+ yo based on the picture below.

Answer:
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Numbers In Order

Write the following numbers in order, from the smallest to the largest.

Solution:

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