Question
Which of the following element is used for the
manufacture of the safety-matches?Solution
The element phosphorus is used to produce safety matches. During manufacture, the match stick is soaked in ammonium phosphate, which prevents ‘afterglow’ once the flame has gone out, and paraffin, which ensures that it burns easily.
A stone worth Rs.3800 drops and breaks with weight in the ratio 2:3:5. The price of stone is directly proportional to square of its weight. Find the tot...
In a class of 236 students, 136 are girls and remaining are boys. Among boys, the ratio of number of boys who are wearing caps to those who are not wear...
If x runs are second by Rohit, y runs by Shreyas and z runs by Virat, then x : y = y : z = 5:3. If total number of runs scored by Rohit, Shreyas and Vir...
Rs.1581 is divided among A, B and C in the ratio 10 : 15 : 6. What is the share of B?
In an office, the ratio of the number of males to number of females is 9:4. If 2 males joined the class and 8 females left the class, then the ratio of ...
- A total of Rs. ‘K’ was to be distributed among X, Y, and Z in ratio of 6:5:7 respectively but due to some reason the money was falsely distributed in r...
- In a company, 60% of the number of girls is equal to two - third of the total number of boys. When 40 new girls joined the company, then 25% of the number ...
If A : B = 9:7 and A is 10 more than B then find the sum of A and B.
‘P’ had four Rs. 500 notes and a certain number of Rs. 50 notes with him while ‘Q’ had eleven Rs. 200 notes and one Rs. 500 note with him. Later...
Find the fourth proportion of (k + 2), (2k), and (3k + 6). (Note: 'k' is the smallest two-digit prime number.)
