The numbers 1, 3, 5, 7______99 and 128 are multiplied together. The number of zeros at the end of the product must be: 

$$ \sqrt{217+\sqrt{48+\sqrt{256}}}=?$$

Krishna bought a camera and paid 20 % less than its original price. He sold it at 40 % profit on the price he had paid. The percentage of profit earned by Krishna on the original price was 

If a vendor sells apples at Rs 170 per kg he suffers 15 % loss. If he sells at Rs 230 per kg, then what is his profit percentage? 

A and B have money in the ratio 2: 1. If A gives Rs. 2 to B, The money will be in the ratio 1: 1. What were the initial amounts they had? 

If the cost of production of an article is 2/5 of its marked retail price, If it is sold at 10 % discount then what will be profit ? 

What is the average of the following numbers?
38, 92, 45, 25, 60

A box contains 56 in the form of coins of one rupee, 50 paise and 25 paise. The number of 50 paise coins is double the number of 25 paise coins and four times the number of one rupee coins. How many 50 paise  coins are there in the box?