Question

a group of 50 students travel by bus.some took 20rs ticket and others took 45 rs ticket. how many students bought 20rs ticket

Answer 1

Hi Saravanan,

20x + 45y = total amount = k
x+y = 50

solve for x and y in above equations
y = 50 - x
20x + 45(50-x) = k
20x +2250 -45x = k
25x = 2250 - k
x = 90 - k/25
y = 50-x = k/25 - 40

x value will give the number of students who bought Rs20 tickets


Hope it helped