How many numbers are there between 100 and 300 which either begin with or end with 2?

(a) Total number of candles = 15 × 12 × 39 = 7020

 (c) Number of mangoes = 12 dozens = 12 × 12 = 144  Number of mangoes in 43 boxes = 43 × 144 = 6192

(a) Task 1 can not be assigned to either person 1 or 2 i.e. there are 4 options. Task 2 can be assigned to 3 or 4 So, there are only 2 options...

(a) From 100 to 199, there are 10 numbers ending with 2. They are 102, 112, 122, 132, 142, 152, 162, 172, 182, 192. And from 200 to 300, there are 100...

We need to divide by 100 here just to convert cm to meter. 1 cm = 1/100 m Hope you understand

(b) According to question R = y and y = 2G ∴ R = 2G Hence, the number of red balls is double the number of green balls.

(c) 6 numbers are there from 5 to 100.

correct answer is (D) 4 

(d) Port Said and Suez

Yes ,I believe that this world will end some day but when nobody knows. Whether the sun gets hot or it gets colder, in both the situations, end of this...