Answer:
The correct answer is the last option.
Step-by-step explanation:
When you have a fraction with complex numbers, the first step to simplify is to multiply up and down the conjugate of the denominator, this will eliminate the complex part of the denominator, and in this way you can separate the expression in its real and complex part.
For the expression:
The denominator conjugate is 4 + 2i
When multiplied, the denominator is:
The ratio of number of girls and boys in a class of 30 students is 7:8
<h3>To Find:</h3>The ratio of number of girls and boys if 5 new boys admit in the class.
<h3>Assumption:</h3>Let the number of students be x.
<h3>Solution:</h3>According to the question,
7x + 8x = 30
or, 15x = 30
or, x =
or, x = 2
7x = 7(2) = 14
8x = 8(2) = 16
There were 14 boys and 16 girls in the school.
After admitting 5 new boys, we get
14 + 5 = <u>19</u>
The ratio of number of girls and boys now is 16:19.
<h2>Answer:</h2><u>1</u><u>6</u><u>:</u><u>1</u><u>9</u>