Step 1: Write what the problem says. The Fahrenheit temperature (F) is 90% more than the Celsius temperature (C). This means: F=C+0.9C=1.9C Step 2: Use the formula between Celsius and Fahrenheit. The usual formula connecting C and F is: ‌
C
5
=‌
F−32
9
Step 3: Substitute what you found in Step 1 into the formula from Step 2. Replace F with 1.9C : ‌
C
5
=‌
1.9C−32
9
Step 4: Solve for C. Multiply both sides by 9 to get rid of the denominator: 9C∕5=1.9C−32 Now multiply both sides by 5 : 9C=5(1.9C−32) 9C=9.5C−160 Take 9C from both sides: ‌9.5C−9C=160 ‌0.5C=160 So, C=320 Step 5: Find F using the value of C. Use F=1.9C : F=1.9×320=608∘F