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RS Aggarwal Solutions Class 7 Mathematics Solutions for Percentage Exercise 10C in Chapter 10 - Percentage
Prev
A number increased by 20% gives 42. The number is
(a) 35 (b) 28 (c) 36 (d) 30
Answer:
Solution:-
Because
(a) 35
Let the required number be x
Now,
= x + 20% of x = 42
= [x + {(20/100) × x}] = 42
= [x + {20x/100}] = 42
= [x + {x/5}] = 42
= [(5x + x)/5] = 42
= [6x/5] = 42
= x = (42 ×5)/6
= x = (7 × 5)
= x = 35
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