C = # of carpenter hrs , b = # of blacksmith hrs
c + b = 30...c = 30 - b
20c + 25b = 690
20(30 - b) + 25b = 690
600 - 20b + 25b = 690
-20b + 25b = 690 - 600
5b = 90
b = 90/5
b = 18 <== hrs worked as blacksmith
c + b = 30
c + 18 = 30
c = 30 - 18
c = 12 <== hrs worked as carpenter
9514 1404 393
Answer:
x + 15
Step-by-step explanation:
The overall length is 2x+15, and the dotted side is shown to be x shorter than that. Its length is ...
2x+15 - x = x + 15 . . . . length of dotted side
Answer:
x = -15
Step-by-step explanation:
Multiply both sides by 3.
Answer:
5x=90 x=90/5=18. So, the answer is 18.
