The ratio of the number of notebooks to the number of books is 1 3 If the average weight of the book...........

Quantitative Aptitude (CDS) Average

The ratio of the number of notebooks to the number of books is 1 : 3. If the average weight of the books is 1.3 kg and the average weight of both the books and notebooks is 1 kg, then find the average weight of the notebooks?

0.1 kg

0.2 kg

1 kg

0.11 kg

Explanation:

We have , n1 / n2 = A2 – Aw / Aw – A1
Or 1/3 = 1.3 – 1 / 1 – x
Or 1/3 = 0.3 / 1-x
Or 1 – x = 0.3 × 3 = 0.9
Or x = 1 – 0.9
Or x = 0.1
Therefore , average weight of the notebooks = 0.1 kg