Given: Product of two numbers is 2197, one number is 13 times the otherTo do: Find the other numberSolution:Let one number be $x$ Second number must be 13 times $x = 13x$$x \times 13 x = 2197$  [product of two numbers is 2197]$13 x^2=2197$ $x^2=\frac{2197}{ 13}$ $x^2=169$ $x=13$ So, first number is 13 and second number ... Read More

To do: Find the sign of the product of $-90$ and $+9$Solution:We know that, positive $\times$ positive = positive integernegative $\times$ positive  = negative integernegative $\times$ negative= positive integerWhenever we multiply negative integers, even number of times, then we get a positive integer.Since, 90 is even number, multiplication of 90 ... Read More

To find: We have to find how much 1 billion is equal to.Solution: 1 Billion is equal to 100 Crore. 1 Billion = 1,00,00,00,000 = 100 Crore = 1000 Million = 10,000 Lakhs

Carbon monoxide (CO) is an odourless, colourless gas formed by the incomplete combustion of fuels. When people are exposed to CO gas, the CO molecules will displace the oxygen in their bodies and lead to poisoning.Carbon monoxide is a very important industrial compound.In the form of producer gas or water ... Read More

Equations in which the highest power of variables is one are called linear equations. Consider the following equation: 15k - n = 23 In the equation 15k - n = 23, power of k and n is 1. So, the equation 15k - n = 23 is a linear equation.

Given: The Length of a rectangle field is thrice its breadth and the area of the field Is 7500 Metre Square.To find: We have to find the cost of fencing.Solution:Let the breadth of the field = aSo the length of the field = 3aNow, Length  x  Breadth = Area of ... Read More

Virus The word Virus comes from the Latin neuter vīrus referring to ‘to poison’ and other ‘toxic liquids’.Viruses are non-cellular beings that consist of a nucleic acid core (DNA or RNA) which is surrounded by a protein coat. The nucleic acid encodes the unique genetic information for each virus. The shape ... Read More

Given: 13.8 + 13.8 + 13.8Solution: 13.8 + 13.8 + 13.8 = 41.4

Given: The total amount collected is 2704.To find: We have to find the number of students who went to trip.Solution: Let the number of students = aSo rupees contributed by each student = aNow, (Number of students) x (Rupees contributed by each student) = Total amount collecteda x a = 2704a2 ... Read More

Wiring done in domestic premises (houses), for providing electrical power for lighting, fans and domestic appliances with all the safety precautions followed is called domestic wiring