diff --git a/src/challenge.ts b/src/challenge.ts
index 63a7766..cbb4e7c 100644
--- a/src/challenge.ts
+++ b/src/challenge.ts
@@ -9,6 +9,7 @@
 // logger<number | string>([1, 2, 3, "one", "two", "three"]);
 function logger<T>(array: T[]): void {
   // write your code here...
+  array.forEach((element) => console.log(element));
 }
 
 // `toCelsius` function that:
@@ -20,7 +21,7 @@ function logger<T>(array: T[]): void {
 function toCelsius(temperatures: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return temperatures.map((n) => (n - 32) * (5 / 9)); // replace empty array with what you see is fit
 }
 
 // `hottestDays` function that:
@@ -33,7 +34,7 @@ function toCelsius(temperatures: number[]): number[] {
 function hottestDays(temperatures: number[], threshold: number): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return temperatures.filter((n) => n > threshold); // replace empty array with what you see is fit
 }
 
 // `logHottestDays` function that:
@@ -42,6 +43,11 @@ function hottestDays(temperatures: number[], threshold: number): number[] {
 // - Log temperatures that exceed the threshold to the console IN DEGREES CELSIUS  (hint: you can combine all previous functions)
 function logHottestDays(temperatures: number[], threshold: number): void {
   // write your code here...
+  temperatures
+    .filter((n) => n > threshold)
+    .map((n) => (n - 32) * (5 / 9))
+    .forEach((t) => console.log(t));
+  // logger(toCelsius(hottestDays(temperatures, threshold)));
 }
 
 export { logger, toCelsius, hottestDays, logHottestDays };
diff --git a/src/filtering.ts b/src/filtering.ts
index 49411d8..b22d64a 100644
--- a/src/filtering.ts
+++ b/src/filtering.ts
@@ -12,7 +12,7 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 function greaterThanTwentyFive(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.filter((n) => n >= 25); // replace empty array with what you see is fit
 }
 
 // `divisibleByFive` function that:
@@ -23,7 +23,7 @@ function greaterThanTwentyFive(numbers: number[]): number[] {
 function divisibleByFive(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.filter((n) => n % 5 === 0); // replace empty array with what you see is fit
 }
 
 export { greaterThanTwentyFive, divisibleByFive };
diff --git a/src/mapping+filtering.ts b/src/mapping+filtering.ts
index 269ad83..ec07e47 100644
--- a/src/mapping+filtering.ts
+++ b/src/mapping+filtering.ts
@@ -12,7 +12,7 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 function filteredAndSquared(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.filter((n) => n >= 20).map((n) => n ** 2); // replace empty array with what you see is fit
 }
 
 // `filteredAndTripled` function that:
@@ -23,7 +23,7 @@ function filteredAndSquared(numbers: number[]): number[] {
 function filteredAndTripled(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.filter((n) => n % 5 === 0).map((n) => n * 3); // replace empty array with what you see is fit
 }
 
 export { filteredAndSquared, filteredAndTripled };
diff --git a/src/mapping.ts b/src/mapping.ts
index 6f18eef..76b0b94 100644
--- a/src/mapping.ts
+++ b/src/mapping.ts
@@ -12,7 +12,7 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 function squaredNumbers(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.map((n) => n * n); // replace empty array with what you see is fit
 }
 
 // `doubledNumbers` function that:
@@ -23,7 +23,7 @@ function squaredNumbers(numbers: number[]): number[] {
 function doubledNumbers(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.map((n) => n * 2); // replace empty array with what you see is fit
 }
 
 export { squaredNumbers, doubledNumbers };