diff --git a/number-systems/Part-1.md b/number-systems/Part-1.md
index d8f9c290e..f0e6dff40 100644
--- a/number-systems/Part-1.md
+++ b/number-systems/Part-1.md
@@ -7,48 +7,49 @@ The goal of these exercises is for you to gain an intuition for binary numbers.
 The answers to these questions should be a number, either in binary, hex, or decimal.
 
 Q1: Convert the decimal number 14 to binary.
-Answer:
+Answer: 1110
 
 Q2: Convert the binary number 101101 to decimal:
-Answer:
+Answer: 45
 
 Q3: Which is larger: 1000 or 0111?
-Answer:
+Answer:1000
 
 Q4: Which is larger: 00100 or 01011?
-Answer:
+Answer:01011
 
 Q5: What is 10101 + 01010?
-Answer:
+Answer: 100000
 
 Q6: What is 10001 + 10001?
-Answer:
+Answer: 100010
 
 Q7: What's the largest number you can store with 4 bits, if you want to be able to represent the number 0?
-Answer:
+Answer: 15
 
 Q8: How many bits would you need in order to store the numbers between 0 and 255 inclusive?
-Answer:
+Answer:8
 
 Q9: How many bits would you need in order to store the numbers between 0 and 3 inclusive?
-Answer:
+Answer: 2
 
 Q10: How many bits would you need in order to store the numbers between 0 and 1000 inclusive?
-Answer:
+Answer: 10
 
 Q11: Convert the decimal number 14 to hex.
-Answer:
+Answer: E
  
 Q12: Convert the decimal number 386 to hex.
-Answer:
+Answer: 182
 
 Q13: Convert the hex number 386 to decimal.
-Answer:
+Answer: 902
 
 Q14: Convert the hex number B to decimal.
-Answer:
+Answer: 11
 
 Q15: If reading the byte 0x21 as a number, what decimal number would it mean?
-Answer:
+Answer: 33
 
 Q16: Continues in Part-2
+
diff --git a/number-systems/Part-2.md b/number-systems/Part-2.md
index 68b0933d9..13b3185a8 100644
--- a/number-systems/Part-2.md
+++ b/number-systems/Part-2.md
@@ -7,16 +7,20 @@ The goal of these exercises is for you to gain an intuition for binary numbers.
 The answers to these questions will require a bit of explanation, not just a simple answer.
 
 Q16: How can you test if a binary number is a power of two (e.g. 1, 2, 4, 8, 16, ...)?
-Answer:
+Answer: A binary number is a power of two if it has exactly one 1 bit and all other bits are 0. For example: 100 000 only has only 1 bit so power of two, 2⁵. 
+        However 100 100  has two one bits  so not power of two instead  2⁵+ 2²
 
 Q17: If reading the byte 0x21 as an ASCII character, what character would it mean?
-Answer:
+Answer:0x21 convert to binary number: 0b0010001 which represents ! character in ASCII program
 
-Q18: If reading the byte 0x21 as a greyscale colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
-Answer:
+Q18: If reading the byte 0x21 as a greyscale color, as described in "Approaches for Representing Colors and Images", what color would it mean?
+Answer: due to that 0x00=black 0xFF=white, ox21 should be low value(33 out of 255 in decimal value) so it should be dark grey(almost dark)
 
 Q19: If reading the bytes 0xAA00FF as a sequence of three one-byte decimal numbers, what decimal numbers would they be?
-Answer:
+Answer: AA=160(16*10+10=170),00=00, FF=255(16*15+15=255) and also two hexadecimal number is one-byte binary number, so 0xAA00FF as a sequence of three one-byte
+        decimal numbers are 170,0,255
+
+Q20: If reading the bytes 0xAA00FF as an RGB color, as described in "Approaches for Representing Colors and Images", what color would it mean?
+Answer: As red = 0xAA = 170,Green = 0x00 = 0,Blue = 0xFF = 255 so RGB(170, 0, 255) so it shows strong red component,no green and strong blue component.
+        The color should be a bright purple / magenta color.
 
-Q20: If reading the bytes 0xAA00FF as an RGB colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
-Answer: