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    Subject

    Quantitative Aptitude

    Topic

    Average

    The average temperature of Delhi of Monday, Tuesday, Wednesday and Thursday was 58° C. The average temperature of Tuesday, Wednesday, Thursday and Friday was 60°C. If the temperatures of Monday and Friday were in the ratio of 7:8, then what was the temperature of Friday?

    ক)
    58°C
    খ)
    64°C
    গ)
    51°C
    ঘ)
    69°C
    ঙ)
    None of these

    Explanation

    We know that: Average=sum of elementsnumber of elementsAverage = \frac{{sum\ of\ elements}}{{number\ of\ elements}} ⇒ Monday + Tuesday + Wednesday + Thursday = 58 × 4 = 232 ________ (1) ⇒ Tuesday + Wednesday + Thursday + Friday = 60 × 4 = 240 ________ (2) ⇒ Monday : Friday = 7 : 8                             _________(3) Now, subtracting equation (1) from equation (2), we get ⇒ Monday =8(8−7)×7=56= \frac{8}{{\left( {8 - 7} \right)}} \times 7 = 56 ⇒ Friday =8(8−7)×8=64= \frac{8}{{\left( {8 - 7} \right)}} \times 8 = 64 ∴ Temperature on Friday was 64°C

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