Ni : Zn: Cu = 7:2:9 =7x : 2x : 9x
7x+2x+9x = 3.8
18x=3.8
x=3.8/18=1.9/9≈0.21
Ni: 7x=7*0.21=1.47 ≈1.5 kg
Zn: 2x=2*0.21=0.42≈0.4 kg
Cu: 9x=9*0.21=1.89 ≈1.9 kg
Check 1.5+0.4+1.9 =3.8 True
The answer should be 9.
After you solve what's in the parentheses, you solve the problem starting from left to right.
6÷2(1+2)
6÷2(3)
3(3)
9
Answer:
Rosselyn: 22
Jacqueline: 10
Susan: 25
Step-by-step explanation:
$57 total
Jacqueline has the least.
Susan has the most. (15 more)
Rosselyn is in the middle. (12 more)
Susan has 3 more than Rosselyn.
57 - 12 - 15 = 30
If one square takes 16.4 cm of wire, this means that to form 25 identical squares you need 25(16.4) cm of wire = 410 cm
To convert this to m you just need to divide it by 100 because there are 100 cm in one meter = 4.1 m
Therefore your final answer is: You need 4.1 m of wire to form 25 squares, each with a perimeter of 16.4 cm.