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The mass of 4 similar music books and 6 biology books is 7.2kg. The mass of 2 such music books is 3.4kg.
Find the total mass of 2 music books and 6 Biology books
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An attentive reader should notice that the targeted collection of books
(2 music books and 6 Biology books) can be obtained from the original set of books
(4 music books and 6 Biology books) by removing 2 music books.
Therefore, we subtract the mass of 2 music books (3.4 kg) from the mass
of the original set of books (7.2 kg), and we obtain the answer immediately
7.2 - 3.4 = 3.8 kilograms.
ANSWER. The total mass of 2 music books and 6 Biology books is 3.8 kilograms.
Solved completely by the way as expected, with complete explanations.
