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At room temperature of 30 degree celsius, a glass of water takes one minute to cool from 80 degree celsius to 60 degree Celsius. How long will it take to further cool from 60 degree celsius to 50 degree celsius?

There are 7 choices for first digit, 6 for second and 5 for third digit. So, there can be 7x6x5=210 3-digit numbers.

Let the third side be x. Then the equal sides are 2x-4. As we know, Perimeter=Sum of all the sides, i.e., 57=x + (2x-4) + (2x-4) Solve this, you will get the value of x. Then place the value of x in 2x-4. That is the required answer. (22)

thank you bobpursley

Here, mass = 700g = 0.7 kg volume = mass/density = 0.7/1000 (as density of water = 1000 kg/cb m) = 7x10^-4 meter cube = 700 cm cube Volume of cube = (10)^3 = 1000 cm^3 Volume of cube ouside water = 1000-700 = 300 cm^3