6.05] There were 150 people at the Junior-Senior dance Sasha and her friends attended. Junior tickets were $2.00 each and Senior tickets were $3.50 each. The total receipts for the dance were $405. How many Juniors bought tickets?

70

80

90

100

Question

6.05] There were 150 people at the Junior-Senior dance Sasha and her friends attended. Junior tickets were $2.00 each and Senior tickets were $3.50 each. The total receipts for the dance were $405. How many Juniors bought tickets?

70

80

90

100

amistre64 · Answer

j = (405 - 150(3.50))/(2.00-3.50)

anonymous · Answer

80

amistre64 · Answer

j + s = 140   ; *-y
jx + sy = 405

-jy  -sy = -140y
  jx +sy = 405
----------------
j(x-y)    = 405 - 140(y)

         j = (405 - 140(y))/(x-y)  ; where x and y are tick prices