I have completed the assignment in the past. Not sure why it was missing. Also, the npm test does not work fro me, but the assignment is all correct.

package.json

@@ -0,0 +1 @@
+{}

problems/variables.js

@@ -7,6 +7,13 @@
 //  * For example, if you were born in 1988, then in 2026 you'll be either 37 or 38, depending on what month it is in 2026.
 //  * Log them to the screen like so: "I will be either `ageMin` or `ageMax` in `futureYear`", substituting the values.
 
+const birthyear = 1997
+let futureYear = 2034
+let ageMin = futureYear - birthyear
+let ageMax = ageMin + 1
+console.log("I will be either " + ageMin  + " or " + ageMax + " in " + futureYear)
+
+
 // ## Problem Two
 
 // Snack Supply Calculator:
@@ -16,6 +23,11 @@
 //  * Calculate how many snacks you would eat total, from your current age until the maximum age.
 //  * Log the result to the screen like this: "You will need `snackNumber` to last you until the age of `maxAge`".
 
+let currentAge = 23
+let maxAge = 55
+let snack = 2
+let snackNumber = (maxAge - currentAge) * 365 * snack
+console.log ('You will need ' + snackNumber + ' to last you until the age of ' + maxAge)
 // ## Problem Three
 
 // Calculate properties of a circle, using the definitions: http://math2.org/math/geometry/circles.htm 
@@ -24,6 +36,11 @@
 //  * Calculate the area based on the radius, and log "The area is `areaOfCircle`".
 //  * Hint: https://www.w3schools.com/jsref/jsref_pi.asp
 
+let radius = 100
+let circumferenceResult = 2 * Math.PI * radius
+let areaOfCircle = Math.PI * (radius ** 2)
+console.log ("The circumference is " + circumferenceResult + " and the circle area is " + areaOfCircle)
+
 // ## Problem Four
 
 // Temperature Converter:
@@ -32,7 +49,13 @@
 //  * Now store a fahrenheit temperature into a variable.
 //  * Convert it to celsius and output "`tempInFahrenheit`°F is `tempInCelsius`°C."
 
+let tempInCelsius = 50
+let tempInFahrenheit = 1.8 * tempInCelsius + 32
+console.log (tempInCelsius + ' °C is ' + tempInFahrenheit +  ' °F')
 
+let tempInFahrenheit1 = 1
+let tempInCelsius1 = (tempInFahrenheit1 - 32) * (5/9)
+console.log (tempInFahrenheit1 + ' °F is ' + tempInCelsius1 +  ' °C')
 // ## Problem Five
 
 // Grades Calculator:
@@ -44,6 +67,18 @@
 //  * Find the average grade of all students
 //  * Print out if Dee's grade is higher than the class average
 
+let aliceGrade = 45
+let bobGrade = 78
+let camGrade = 100
+let currentAvg = ((aliceGrade + bobGrade + camGrade)/3)
+let deeGrade = 100
+let averageWithDee = ((aliceGrade + bobGrade + camGrade + deeGrade)/4)
+console.log("Dee grade is higher than class average: " + deeGrade > averageWithDee)
+
+
+
+
+
 // ## Problem Six
 
 // Find the last number:
@@ -57,6 +92,10 @@
 // Hint:
 // Use the remainder % operator.
 
+let a = 123
+let lastDigit = a % 10
+console.log (lastDigit)
+
 
 // ## Problem Seven
 
@@ -82,6 +121,13 @@
 // * alice + x = y * (bob + x)
 // * Solve for alice
 
+let bobAge = 12
+let x = 3
+let y = 2
+let aliceAge = y * bobAge + (y - 1) * x
+console.log (aliceAge)
+
+
 // ## Problem Eight
 
 // * Cat and Dog Percentages
@@ -95,6 +141,14 @@
 // * 25% of the daycare animals are cats
 // * 75% of the daycare animals are dogs
 
+let numberOfCats = 20
+let numberOfDogs = 60
+let percentOfCats = (numberOfCats / (numberOfCats + numberOfDogs))
+let percentOfDogs = (numberOfDogs / (numberOfCats + numberOfDogs))
+let roundPercentOfDogs = Math.floor(percentOfDogs)
+let roundpercentOfCats = Math.floor(percentOfCats)
+console.log(roundPercentOfDogs + " of of the daycare animals are dogs")
+console.log(roundPercentOfCats + " of of the daycare animals are cats")
 // ## Problem Nine
 
 // * Leap Year Calculator
@@ -106,7 +160,9 @@
 // * Years that are divisible by 100 are not leap years if they are not also divisible by 400. 
 // * For example 1900 was not a leap year, but 2000 was. Print "Leap year!" or "Not a leap year!" depending on the year you are provided.
 
-
+let leapYear = 2020
+let isLeapyear = (leapYear % 4 === 0) && (leapYear % 100 !== 0 || leapYear % 400 === 0)
+console.log(((isLeapYear) && "Leap year!") && ((isLeapYear) || 'Not a leap year!')
 // ## Problem Ten: Predict the output
 
 // For this section write what you think will be logged as a comment next to `console.log` like so: `console.log('Cat') //'Cat'` before running the code. Then execute your file and compare with your prediction.
@@ -116,22 +172,22 @@
 //     let num1 = 2
 //     let num2 = 5
 //     let num3 = num1 * num2
-//     console.log(num3)
+//     console.log(num3) // 10
 //     ```
+//     '10'
 
 // b. 
 //     ```js
 //     let str = 'jel' 
 //     str += 'lo'
-//     console.log(str)
-//     ```
+//     console.log(str) // jello
+
+//     `jello'
 
 // c. 
 //     ```js
 //     let string =  'My favorite number is ';
 //     let number = 42
 //     let sentence = string + number
-//     console.log(typeof(sentence))
-//     ```
-
-
+//     console.log(typeof(sentence)) //string
+//     ``