Question

at a car park 50% of vehicles parked were car, 30% were motorcycles and the rest of 40 vehicles were vans. 1- calculate the no of motor cycles parked there. 2-if 40 car left the car park what percentage vehicle parked there were cars.

Answer 1

let x be the total no. of vehicles parked

no. of cars = 50% of x
= 50x/100
= 5x/10
no. of motorcycles = 30% of x
= 30x/100
= 3x/10
and no. of vans = 40
but,
no. of vans + no. of motorcycles + no. of cars
= x
=> 40 + 5x/10 + 3x/10 = x
=> 40 + (5x + 3x)/10 = x
=> 40 + 8x/10 = x
=> (400 + 8x)/10 = x
=> 400 + 8x = 10x
=> 400 = 10x - 8x
=> 400 = 2x
=> 400/2 = x
=> x = 200

therefore no. of motorcycles = 3x/10
= (3 × 200)/10
= 600/10
= 60

cars remaining if 40 cars left = 5x/10 - 40
= (5×200)/10 - 40
= 1000/10 - 40
= 100 - 40
= 60

percentage of cars remaining = (60/200) × 100
= (3/10) × 100
= 300/10
= 30%

Answer 2

400 Kahan se aaye ha ....