Pankhudi has a toaster with two slots that toasts one side of each piece of bread at a time, and it takes one minute to do so.
If she wants to make 3 pieces of toast, what is the least amount of time she needs to toast them on both sides?
OPtion
1) 2 minutes
2) 3 and half minutes
3) 4 minutes
4) 300 seconds
5) 2 and half minutes
6) 180 seconds
7) 240 seconds
8) 600 seconds
9) 5.5 minutes
10) None of these
Solution
3 minutes. She puts two pieces in the toaster, toasting one side of each. Then she flips one of them, takes one out, and puts the completely untoasted piece into the toaster. Finally, she takes out the toasted piece and puts the two half-toasted pieces of bread into the toaster for a minute and she's done.
When you reverse the digits of the number 14 the number increases by 27. What is the sum of all such two digit numbers which increase by 27 when their digits are reversed?
10x + y - (10y + x ) = 27
=> 9x-9y = 27
=> x - y = 3
Following numbers satisfy the criteria of x-y=3
14, 25, 36, 47, 58, 69
Their Sum = 14 +25 + 36 + 58 + 69 =249
A shopkeeper has 2020 kgs of rice, part of which he sells at 1% loss and the rest at 7% profit. He gains 2% on the whole. What is the difference between the quantities of rice sold at 7% profit and that sold at 1% loss?