an hour of vacuuming and mopping uses 280 calories this is 40% of the number of calories burned by riding bikes for 1 hour what's the total number of calories burned by riding the bicycle for 2 hours

280 is 40% of the calories burned riding bikes. so 20% of it is 140 so to find how many calories total multiply 20*5 to get 100 then multiply 140*5 to get 700. So the number of calories burned by riding the bicycle in 1 hour is 700 then mulitiply that by 2 and that equals 1,400