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RS Aggarwal Solutions Class 7 Mathematics Solutions for Linear Equations in one variable Exercise 7B in Chapter 7 - Linear Equations in one variable
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A number is (2/5) times another number. If their sum is 70. Find the numbers.
Answer:
Solution:-
Let the required number be x.
Then,
= x + (2x/5) = 70
= (5x + 2x)/5 = 70
= (7x/5) = 70
Multiplying both side by (5/7)
= (7x/5) × (5/7) = 70 × (5/7)
= x = 50
The other number is (2x/5)
= (2 × 50)/5
= 100/5
= 20
∴the required numbers are 50 and 20
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