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Percentage | Percentage Exercise 10C

Question 7

A number increased by 20% gives 42. The number is

(a) 35 (b) 28 (c) 36 (d) 30

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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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Our top 5% students will be awarded a special scholarship to Lido.

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Question 7

A number increased by 20% gives 42. The number is

(a) 35 (b) 28 (c) 36 (d) 30

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

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

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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