Solve this : Q Sonia wants to purchase a pen She has money between Rs 200 - Maths - Knowing Our Numbers

Question

Solve this :

Q Sonia wants to purchase a pen She has money
between Rs 200 and Rs 300 The cost of the pen is divisible by 3 If
she subtracts Rs 7 from the cost price, she can divide the cost of
the pen by 10 and 20 If she adds Rs 3 to the cost price, the cost
price is divisible by 9 How much will Sonia pay for the pen ?

Varun Rawat · Accepted Answer

C 1 The given number is 24*23*
We know that a number is divisible by 11, if the difference of the sum of the digits at odd places and sum of the digits at even places is 0 or divisible by 11
Consider the number 241230
Sum of the digits at odd places = 2 + 1 + 3 = 6Sum of the digits at even places = 4 + 2 + 0 = 6Differerence = 6 - 6 = 0So, 241230 is  the required number that is divisible by 11
5 The given number is 113*4
A number is divisible by 8,if the number formed by last three digits i
e
 hundreds digit, tens digit and ones digit, is divisible by 8
Consider the number formed by last 3 digits as 304
Now, 304 ÷ 8 = 38So, 304 is divisible by 8
Hence, 11304 is the required number that is divisible by 8

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