An elephant eats twice as many peanuts as it does on the previous days. If in 6 days it eats 4 tonnes of peanuts, how much did the elephant eat on the second day to the nearest kilogram?

X + 2x + 4x + 8x + 16x + 32x = 4 tonnes of peanuts; where x represents how peanutseats the elephant first day;

63x = 4000 kilograms;

x = 63,49 kilograms;

On the second day, 2 * 63,49 = 126,98 kilograms ≈ 123 kilograms.