Answer:
39
Step-by-step explanation:
d = s - 15
d + s = 63
Replace d with s - 15
s - 15 + s = 63
2s -15 = 63
2s = 78
s = 39
Answer:
4
Step-by-step explanation:
18/4.5=4
Answer:
12
Step-by-step explanation:
54 percent
You add the two together to get 39, then divide 21 by 39. This gives you 0.538, which turns into 54%