Answer:
12
Step-by-step explanation:
the answer is 12
(ii) the number of such books that have a mass
of 20 kg.
Answer:
The mass of 150 books = 41.7kg
The number of books that have mass 20kg = 72 books
Step-by-step explanation:
(I) Number of identical books = 108
Mass of books = 30 kg
Mass of 150 books = ?
Let the mass of 150 books = x kg
To find the mass of 150 books we will use ratio and proportion:
108 books: 30kg = 150 books: x kg
You can also write it like this because ratio can be written in division:
108/30 = 150/x
By cross multiplication:
108x = 150*30
108 x= 4500
Divide both sides by 108
108 x/108 = 4500/108
x= 41.7
Thus the mass of 150 books = 41.7kg
( ii ) The number of books that have a mass of 20 kg = ?
Let assume that the number of books of mass 20 kg = y books
We will again use ratio and proportion method.
108 books: 30kg = y: 20kg
We can write it as:
108/30 = y/20
By cross multiplication:
108 *20 = 30y
2160= 30y
Divide both the terms by 30
2160/30 = 30y/30
72 = y
Therefore the number of books that have mass 20kg = 72 books ....
The organic farmer will have 13/36 part of the land for planting potatoes.
A fraction is written in the form of p/q, where q ≠ 0.
Fractions are of two types they are proper fractions in which the numerator is smaller than the denominator and improper fractions where the numerator is greater than the denominator.
Assuming the total land to be 1.
∴ The remaining land after planting tomatoes is (1 - 5/9) = 4/9.
The remaining land after planting green beans is (4/9 - 1/12) = (16 - 3)/36.
= 13/36 and it is the remaining land he can plant potatoes.
learn more about fractions here :
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1. 2x – 3y = 9 A. positive
B. negative
2. y = −4x + 5
3. x y
−1 −5
1 1
3 7
4. x y
1 −2
2 −6
3 −10
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