M4maths Previous Puzzles

25 Jan 2010 Temperature Increase?

On increasing the temperature by 30 degree centigrade, rate of a chemical reaction
becomes 15.625 times the initial rate. If every 10 degree centigrade increment in temperature makes
the similar multiple change (x), then x is equal to

OPtion

1) 0.5
2) 3.5
3) 4.5
4) 1.5
5) 2.5
6) 5.2083
7) 2.705
8) 2.505
9) 5.05
10) 1.25

Solution

30 degree centigrade means three laps of 10 degree centigrade
According to the given condition
(initial rate) . x . x . x = 15.625 (initial rate)
Or x3 = 15.625
Or x = 2.5

Correct Option: 5 Best Solution (0)