9514 1404 393
Answer:
- Keiko: 17
- Chang: 24
- Abdul: 68
Step-by-step explanation:
Let c represent the number of messages sent by Chang. Then Keiko sent (c-7) messages, and Abdul sent 4(c-7) messages. The total number sent was ...
c + (c -7) +4(c -7) = 109
6c -35 = 109 . . . . . . . . . . simplify
6c = 144 . . . . . . . . . . . add 35
c = 24 . . . . . . . . . . . divide by 6
c-7 = 17
4(c-7) = 68
Keiko sent 17, Chang sent 24, and Abdul sent 68 text messages.
Answer:
Final cost = $2388.75
Step-by-step explanation:
Cost of stereo system = $2500
Sale = 9%
Cost of sale = 9% of 2500
Cost of sale = 
Cost of sale = $225
Price after sale = 2500 - 225 = $2275
Sales tax = 5% of 2275
Sales tax = 0.05 * 2275 = $ 113.75
Final cost = 2275 + 113.75 = $2388.75
Answer:
bought = £3000
sold = £3375
profit = sold price - bought price
= £3375 - £3000
= £375
percentage of profit = (profit/bought price) × 100
=(£375/£3000) × 100
= 0.125 × 100
= 12.5%
You can add the two equations together, this way you get:
5x = 25
You divide by 5:
x = 5
Now you just have to use this number in one of the original equations to get y:
x - 7y = -16
5 - 7y = -16 /subtract 5
-7y = -21 /divide by 7
-y = -3 /multiply with -1
y = 3
