1.

एक सप्ताह के पहले चार दिनों का औसत उच्च तापमान `25^(@)C` है जबकि अंतिम चार दिनों को औसत `25.5^(@)C` है। यदि पुरे सप्ताह का औसत तापमान `25.2^(@)C` है तो चौथे दिन का तापमान है-A. `25^(@)C`B. `25.2^(@)C`C. `25.6^(@)C`D. `25.5^(@)C`

Answer» Correct Answer - C
According to question
`implies` Total temperature of first four days Mon + Tues + Wed + Thu =25 x 4= `100^@`…(i)
`implies` Total temperature of Last Four days Thu + sat + sun =25 x4 = `100^@`…(i)
`implies` Total temperature of Last four days Thr + Fri + sat + sun = 25.5 x 4 =`102^@`...(ii)
`implies` Total temperature of week `=25.2^@ xx 7=176.4^@`
After adding euation (i) + (ii) Mon + Tue + Wed + 2 x Thu + Fri + Sat + sun =`202^@` ...(iv)
after subtracting equation (iv) - (iii) `202-176.4^@=25.6^@ C`
`implies` Temperatrue of 4th day `=25.6^@C`


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