diff --git a/exercise.js b/exercise.js
index da0af63..e0beabb 100644
--- a/exercise.js
+++ b/exercise.js
@@ -1,2 +1,88 @@
 // Good Luck! You got this 💪🏾
-// Write your code here.
+
+/* ## Functions
+
+ 1. Write a function called 'describeCountry' which takes three parameters: `country`,`population` and `capitalCity`. Based on this input, the function returns a string with this format: _'Somaliland has 3.5 million people and its captial city is Hargeisa'_
+2. Call the function 3 times with input data for 3 different countries. store the return values in 3 different variables and log them to the console.
+3. The world population is 7900 million people. Create a function called `percentageOfWorld1` which recieves a `population` value and reutnrs the percentage of the world population that the given population represents. For example, _China has 1441 million people, so it's about 18.2% of the world population_
+   > **NOTE:** To calculate the percentage, divide the given `population` value by 7900 and then multiply by 100
+4. Call `percentageOfWorld1` for 3 populations of countries of your choice, store the results into variables, and log them to the console */
+
+
+// 1.
+function describeCountry (country, population, capitalCity) {
+    return `${country} has ${population} people and its captial city is ${capitalCity}`
+}
+
+// 2.
+let somalilandDes = describeCountry ('Somaliland', '3.5 million', 'Hargeisa')
+let usDes = describeCountry ('The United States', '330 million', 'Washingtion D.C.')
+let ehiopiaDes = describeCountry ('Ethiopia', '115 million', 'Addis Ababa')
+
+console.log (somalilandDes)
+console.log (usDes)
+console.log (ehiopiaDes)
+
+//3.
+function percentageOfWorld1 (population) {
+    return (population / 7900 * 100)
+}
+
+// 4.
+let india = `India is ${percentageOfWorld1 (1380)}% of the world population`
+console.log (india)
+let subSahara = `Sub-Sahara is ${percentageOfWorld1 (1000)}% of the world population`
+console.log (subSahara)
+let china = `China is ${percentageOfWorld1 (1441)}% of the world populaton`
+console.log (china)
+
+/* ## Introduction to arrays
+
+5. Create an array containing 4 population values of 4 countries of your choice and store it in a varaible called `population`
+6. Create an array containing all the neighbouring countries of a country of your choice. Store the array into a varaible called `neighbours`
+7. Log to the console whether the array has 4 elements or not (true or false) */
+
+// 5.
+let population = [115000000, 59000000, 53000000, 45700000]
+
+// 6.
+let neighbours = ['Ethiopia', 'Tanzania', 'Kenya', 'Uganda']
+
+// 7.
+console.log (population.length === 4)
+console.log (neighbours.length === 4)
+
+/* ## Iteration: for loops
+
+8. Console log one by one the countries inside the `neighbours` array.
+9. Console log one by one the countries inside the `neighbours` array but this time in a reverse order. */
+
+// 8.
+for (i = 0; i < neighbours.length; i++){
+    console.log(neighbours[i])
+}
+
+// 9.
+for (i = neighbours.length-1; i >= 0; i--){
+    console.log (neighbours[i])
+}
+
+/* ## Iteration: while loop
+
+10. Do exercise 8 & 9 using while loop */
+
+// 8*.
+i = 0
+while (i < neighbours.length){
+    console.log (neighbours[i])
+
+    i++
+}
+
+// 9*.
+i = (neighbours.length-1)
+while (i >= 0){
+    console.log (neighbours[i])
+
+    i--
+}
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