Question

3. Sagar bought 30 tickets in all, of which some cost 15 and the rest cost 20.
If the total cost of the tickets was 540, how many tickets of 20 were bought? (
(1) 12 (2) 18 (3) 14 (4) 16​

Answer 1

Answer:

18

Step-by-step explanation:

x+y =30      eq 1

15x+20y=540         eq2

multiply eq 1 by 15 so we get a new equation

15x+15y=450      eq 3

so now subtract  eq 3 from eq2

we get y =18 that is ur answer