Before a journey , there were 40 litres of petrol in the tank of a car. after travelling 150 km, 25 litres of petrol were left in the tank. how much further could the car travel? solution?

How do you find the circumfrance of a circle?

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.

Felix wrote several equations and determined that only one of the equations has no solution. which of these equations has no solution?