Mathematics
If 8x + 9y = 42xy and 2x + 3y = 12xy, then the value of is 1/xy : 1. 1 2. 4 3. 6 4.
Related Questions
If 0.4x + 0.3y = 2.3 and 2.5x - 2y = -5, then the value of xy is :
10
12
2.4
1.2
A shopkeeper sold a table and a chair for ₹ 1,050, thereby making a profit of 10% on the table and 25% on the chair. If he had taken a profit of 25% on the table and 10% on the chair, then he would have got ₹ 1,065. What is the cost price of 1 table and 1 chair.
A boatman rowing at the rate of 5 km/hr in still water takes thrice as much time in going 40 km upstream as in going 40 km downstream. What is the speed of the stream?