# Model Activity Task Class 7 Math Solution February 2022

Model Activity Task Class 7 Maths subject has been released by the School Education Department of West Bengal . Here you will find the answers of the Model Activity Task Class 7 maths with full answers and proper explanation .

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## Model Activity Task Class 7 Maths

Model Activity Task are very important for the students of School of West Bengal . These Model Activity Task are useful to know how much knowledge a student has acquired . Here you will get Model Activity Task Class 7 Maths Subject Solutions of the February Month .

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## Model Activity Task Class 7 Maths February 2022 Solutions

The below are the answers and explanation of each and every question of Model Activity Task Class 7 Maths Subject for the Month of February 2022.

Class – VII
Mathematics
Full Marks : 20

Q1. Choose the correct answer :
(i) The simplest form of 9 : 15 is
(a) 18 : 30
(b) 9 : 1
(c) 1 : 15
(d) 3 : 5
Answer and Explanation : Option [d] “ 3 : 5” is the Correct Answer

(ii) There are 36 boys and 28 girls in a class. The ratio of girls to boys is
(a) 9 : 9
(b) 7 : 9
(c) 9 : 14
(d) 18 : 7
Answer and Explanation : Option [b] “7:9” is the Correct Answer

(iii) On comparing 5 : 15 and 2 : 3 , We find that the smaller ratio is
(a) 2 : 3
(b) 3 : 2
(c) 3 : 1
(d) 5 : 15
Answer and Explanation : Option [d] “5:15” is the Correct Answer

(iv) The ratio of the costs of two houses is 4 : 3. The proportional parts of 1st house is
(a) 4/3
(b) 3/4
(c) 4/7
(d) 3/7
Answer and Explanation : Option [c] “4/7” is the Correct Answer

Q2. Write true / false :
(i) The unit of ratio is none.
(ii) The fractional form of a : b is a/b .
(iii) The ratio of Rs 1 Rs 1.30 is 10 : 13
Answer and Explanation :
(i) True
(ii) True
(iii) True

Q3. Write the answers of the following question
(i) A ratio in the simplest form is 5 : 7.If the antecedent is 45, find the consequent.
Answer and Explanation :
The Ration is 5:7
We know that
The antecedent is 5x
The Consequent :7x
According to question ,
Antecedent is 45
therefore , 5x = 45
x= 45/5
x= 9
The Consequent is 7x
7x = 7* 9
63
The answer of the above question is 63
(ii) Write the ratio 2 (1/4) : 5/8 in the simplest form.

Answer and Explanation :
2(1/4) : 5/8
9/4 : 5/8
Multiplying the numerator and denominator by two on the left hand side
(9*2) / (4*2) : 5/8
18/ 8 :5/8
Multiplying by 8 on both side
we get
18:5
Answer of the above question is 18: 5

(iii) Find the compound ratio of the following ratios :
2kg : 480 gm and 120 min : 150 min.

Answer and Explanation :
2kg : 480 gm
Converting kg in gm
we get,
2000 gm : 480 gm
2000/480 = 25/6

25 : 6
120 min : 150 min
120/150
On Solving we get,
4/5
4:5

Now Calculating Compound Ratio :
(25 : 6) * (4: 5 )
(25 *4) / (6*5) = 10 / 3
10 : 3
Answer of the above question is 10 : 3

(iv) For cultivation of paddy 17 bags of cow dung and 3 bags of vegetable peel being mixed. Find the
proportional part of vegetable peel .

Answer and Explanation :
According to questions ,
Total number of bags of cow dung : 17 bags
Total Number of bags of vegetable peel : 3 bags
Total Number of bags : 17 + 3 = 20 bags
Proportion of Vegetable peel in the mixture is : (Number of vegetable peel bags/ Total number of bags mixed )
3/ 20
The answer of the above question is 3/20.

Q4. Rs 12,100 is divided among Madhu, Manash, Kuntal and Indra in the ratio of 2 : 3 : 4 : 2. Calculate and write how which each will get.
Answer and Explanation :
Total amount : Rs 12100
Given Ratio is 2:3:4:2

Now , 2+3+4+2 = 11
Madhu will get the amount = 12100 *(2/11) = 2200
Manash will get the amount = 12100 * (3/11) = 3300
Kuntal will get the amount = 12100 * (4/11) = 4400
Indra will get the amount = 12100 * (2/11) = 2200