Article practice set 1 by Nikhil Sir with tricks

A metal article is to be electroplated with silver. Answer the questions : What will be the nature of the (1) anode (2) cathode?

If 27 identical articles cost Rs. 1,890, how many articles can be bought for Rs. 1,750 ?

By selling an article at 20% discount, a shopkeeper gains 25%. If the selling price of the article is Rs 1,440, find : the cost price of the article.

Sania Mirza is to play with Sharapova in a three set match. For a particular set, the probability of Sania winning the set is √y and if she wins probability of her winning the next set becomes y else the probability that she wins the next one becomes y2. There is no possibility that a set is to be abandoned. R is the probability that Sania wins the first set If Sania loses the first set then the values of R such that her probability of winning the match is still larger than that of her loosing are given by a. R in (1/2,1) b. R in ((1/2)^(1/3),1) c. R in ((1/2)^(3//2),1) d. no values of R

By selling an article at 20% discount, a shopkeeper gains 25%. If the selling price of the article is Rs 1,440, find : the marked price of the article.

The list price of an article is Rs 800 and is available at a discount of 15 percent. Find : (1) the selling price of the article, (ii) the cost price of the article, if a profit of 13 (1)/(3) % is made on selling it.

A shopkeeper sells an article for Rs. 1770 with GST =18% . A customer willing to buy this article, asks the shopkeeper to reduce the price of the article so that he pays only Rs. 1,888 including GST, If the shopkeepar agrees for this how much reduction will the shopkeeper give ?

Let A be the set of all 3xx3 symetric matrices whose entries are either 0 or 1. The number of elements is set A, is

A shopkeeper sells article A at 8% profit and article B at 10% loss, thereby getting a sum of 1,008. If he sells the article A at 10% profit and article B at 8% loss, he would have 1,028. Find the cost price of article A and B to the shopkeeper.