Question 1019145
Hi there,
Make single recording tapes = 'x'
Concert tapes = 'y'
x + y = 25 ........(1)
699x + 1099y = 23075.....(2)
Multiply (1) by 699
699x + 699y = 17475.....(1)
699x + 1099y = 23075....(2)
Subtract (1) from (2)
......400y = 5600
.........y = 14
Substitute y = 14 into (1)
x + y = 25 .......(1)
x + 14 = 25
x = 25 - 14
x = 11
11 x single recording tapes
14 x concert tapes
Hope this helps :-)