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If the average temperature of first four days of the week was 39°C and the average temperature of the week was 40°C, then what was the average temperature of the last three days of the week?
Answer & Solution
Correct Answer:
Option
C
Required average
$$\eqalign{ & = {\left[ {\frac{{\left( {40 \times 7} \right) - \left( {39 \times 4} \right)}}{3}} \right]^ \circ }{\text{C}} \cr & = {\left( {\frac{{124}}{3}} \right)^ \circ }{\text{C}} \cr & = {41.3^ \circ }{\text{C}} \cr} $$
$$\eqalign{ & = {\left[ {\frac{{\left( {40 \times 7} \right) - \left( {39 \times 4} \right)}}{3}} \right]^ \circ }{\text{C}} \cr & = {\left( {\frac{{124}}{3}} \right)^ \circ }{\text{C}} \cr & = {41.3^ \circ }{\text{C}} \cr} $$
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