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1. Study the bar diagram and answer the following questions.

The ratio of the average of the marks obtained in Biology for two terms to the average of the marks obtained in English and Mathematics for first term only is:

A. 43 : 92

B. 39 : 42

C. 29 : 34

D. 23 : 94

Solution:

\begin{aligned} Average mark of biology \\ = \frac{90 + 55}{2} \\ = \frac{145}{2} \end{aligned}

Average of sum of Math first term & English first term

\begin{aligned} = \frac{100 + 70}{2} \\ = \frac{170}{2} \\ ∴ Required ratio \\ = \frac{145}{2} : \frac{170}{2} \\ = 29 : 34 \end{aligned}

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