Let c and d be the number of cds and dvds respectively.
c+d=12
c=12-d
The we are told that:
2c+3d=31, using c found above in this equation gives you:
2(12-d)+3d=31
24-2d+3d=31
24+d=31
d=7
So Phillip bought 7 dvds.
check...
3*7+2(12-7)=31
21+2(5)=31
21+10=31
31=31
Answer:
the answer would be 35
Step-by-step explanation:
Answer: round the cost 90 and percent to 10 use a benchmark percent 0f to 10
Step-by-step explanation: took the test
The answer is 36.
Because 20% of 36 is equal to 7.2
And 36 - 7.2 = 28.80
