Solve the simultaneous equation
x + y = 4,
3x + y = 8

John bought 5 lemons and used 2 of them for a salad how much did he use for. a salad . he used % of the lemons.

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

What is the area of the shaded sector?