This correct answer? if not what is the correct answer

Question

Activity 4. Writing a Mathematical Expression

Directions: Using only one variable, write a mathematical expression for each.

1. Carlo's age in 5 years

x+5

2. The total interest earned after one year when Php 200,000 is invested, part at 6% annual interest rate, and the remaining part at 5.5% annual interest rate

(0.06(P)) + (0.055 (200,000 - P)) (where 'P' represents the amount invested at 6%)

3. The distance travelled by a man driving at the rate of 60 kph

60kph(t)= distance travelled by the man (where 't' is the time in hours)

4. The percentage of alcohol in a mixture of ½ liter of pure water and x liter of 5% alcohol solution

(0.05x/(0.5 + x)) 100

5. The perimeter of a rectangle whose length is three times the width

2(3W + W) (W' represents the width)

6. A three-digit number whose hundreds digit is one-third the tens digit and the tens digits five more than the units digit

100(1/3T+T+T+5)

(where 'T' represents the tens digit)

7. The total peso value of 30 coins consisting of Php 20 coins and Php 10 coins

(20*20) + (10 * 10)

Answer 1

Previously answered.