Twice a number is decreased by $15$ , equals $25$ . Find the number.

20

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25

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30

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35

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Solution

The correct option is A $20$
Let the number be $x$
According to given problem, we have
$2 x - 15 = 25$
$2 x = 25 + 15$
$2 x = 40$
$∴ x = 20$

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Marks	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$
Number of students	$12$	$35$	$15$	$25$	$13$

Size (in cms):	10-15	15-20	20-25	25-30	30-35	35-40
No. of items:	2	8	20	35	20	15

R s

30

20 - 25

25 - 30

Class Interval	5−10	10−15	15−20	20−25	25−30	30−35	35−40
Number of Children	4	5	3	2	6	7	3

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