how many tickets of each kind were sold?
2007-02-28 22:12:00 · 3 answers · asked by diann s 1 in Education & Reference ➔ Homework Help
GIVEN
students tickets= x
outsiders tickets= y
AND
x + y = 640
10x + 25y = 12400
Solving the riddle!
x + y = 640....subtract y from both sides
x = 640 - y ....and then we substitute in the other equation
10(640-y) + 25 y = 12400
6400 - 10y + 25y = 12400.....sub 6400 both sides
- 10y + 25y = 6000....combine
15y = 6000....divide by 15
y = 400
x + y = 640....substitute
x + 400 = 640....sub 400 both sides
x = 240
240 x 10 = 2400
400 x 25 = 10000
2400 + 10000 = 12400
we did it !
2007-02-28 22:20:19 · answer #1 · answered by tomkat1528 5 · 0⤊ 0⤋
x - ticket for students
y - tickets for outsiders
x + y = 640 --------(1)
10x + 25y = 12400 --------(2)
(1) * 10 = 10x + 10y = 6400 -----(3)
solving (2) & (3)
10x + 25y = 12400
10x + 10y = 6400
----------------------------
15y = 6000
-------------------------
y = 6000/15
y = 400
sub y in (1)
x + 400 = 640
x = 240
2007-02-28 23:01:45 · answer #2 · answered by selva ganesh 3 · 0⤊ 0⤋
You need to use the guess-and-check method to solve this kinda qns
2007-02-28 22:17:22 · answer #3 · answered by befuzzy87 2 · 0⤊ 1⤋