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
Answer:
54
Step-by-step explanation:
multiply by 1.8 and add 32
12*1.8=21.6
21.6+32=53.6
53.6 rounded = 54
Answer:
7,4,15,6
Step-by-step explanation:
7,4,15,6
Yes they can if 7 + 7 equals more then 11 the. The answer is yes
Answer:
1. 12
2. 0.04
3. 196
Step-by-step explanation:
1. 12*12= 144
2. 1/25= 0.04
3. (11-8)^2= 3^2= 9