NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 4: Simple EquationsWrite Equations
Class 7 - Mathematics - Unit 4: Simple Equations
In Questions 57 to 67, express each of the given statements as an equation.
Question. 57
13 subtracted from twice of a number gives 3.
Answer:
2x − 13 = 3
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Question. 58
One-fifth of a number is 5 less than that number.
Answer:
x/5 = x − 5
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Question. 59
A number is 7 more than one-third of itself.
Answer:
x = 7 + x/3
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Question. 60
Six times a number is 10 more than the number.
Answer:
6x = x + 10
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Question. 61
If 10 is subtracted from half of a number, the result is 4.
Answer:
x/2 − 10 = 4
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Question. 63
Five times a number increased by 7 is 27.
Answer:
5x + 7 = 27
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Question. 64
Mohan is 3 years older than Sohan. The sum of their ages is 43 years.
Answer:
x + (x + 3) = 43
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Question. 65
If 1 is subtracted from a number and the difference is multiplied by 1/2, the result is 7.
Answer:
(1/2)(x − 1) = 7
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Question. 66
A number divided by 2 and then increased by 5 is 9.
Answer:
x/2 + 5 = 9
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Question. 67
The sum of twice a number and 4 is 18.
Answer:
2x + 4 = 18