Page 95 - Mathematics

The son’s age after 4 years will be Activity 5.3: Algebra in cooking
(x + 4) years.
The father’s age after 4 years will be Cooking rice dish requires an optimum
(x + 32 + 4) years (x= + 36) years. ratio between the amount of rice to be

After 4 years, the father’s age will cooked and amount of water to be used.
be twice the age of his son. That is, On average, 2 cups of water are enough Tanzania Institute of Education
x + 36 = 2(x + 4) to cook 1 same cup of rice.
x + 36 = 2x + 8 1. Determine an algebraic equation
2 –xx = 36 – 8 which relates the amount of rice
x = 28 and water to be used.
The father’s present age = x + 32 2. If you are to decide on the amount
= 28 32+ of rice to be cooked in a ceremony
= 60 with 300 participants, determine
Therefore, the son’s present age is the average amount of rice needed
28 years and the father’s present age assuming that on average, 1 kg of
is 60 years. rice can be served to 4 people.
3. Use the algebraic equation in task 1
to determine the average amount of
Engage in Activity 5.3 to use algebra water needed to cook the amount of
in cooking as among the daily-life rice you have determined in task 2.
activities.

Exercise 5.4

1. John is 6 years older than Amina. If the sum of their ages is 30 years, find
Amina’s age.

2. Asha’s age is five times the age of Martin. If the sum of their ages is 36
years, find Martin’s age.
3. If the sum of two consecutive numbers is 37, find the numbers.

3
4. When a certain number is added to 7, the result is 12 . Find the number.
1 4
5. If the product of 2 and y is 25, find the value of y.
2 Mathematics Form One
6. The difference between 48 and another number is 17. Find the number.

89

25/10/2024 09:51:29
Mathematics form 1.indd 89
Mathematics form 1.indd 89 25/10/2024 09:51:29