The correct option is: (A) 64 degree
Explanation:
Let the temperatures on first, second, third, fourth and fifth day be x1, x2, x3, x4 and x5, respectively.
Sum of temperatures of first four days = 58 x 4
i.e., x1 + x2 + x3 + x4 = 232 ...(i)
and sum of temperatures on second, third, fourth and fifth day = 60 x 4
i.e., x2 + x3 + x4 + x5 = 240 ...(ii)
Subtracting (i) from (ii), we get x5 - x1 = 8 ...(iii)
Also, temperature of first and fifth day were in the ratio 7 : 8.
Let the temperatures be 7 k and 8 k respectively.
From (iii), we have 8k - 7 k = 8 => k = 8
Temperature of fifth day - 8 x 8 = 64 degree