Solve this:

Solve this: 2. 3. 4. 5. 6. 8. 9. 10. An alloy of iron is 49% iron and other is 28% of iron. How many kilograms of each should be used to get 120kg of 42% iron alloy? The largest angle of a triangle is equal to the sum of the other two angles. The smallest angle is 1/40f the largest angle. Find the angles of the triangle. Solve graphically the pair of linear equations x-Y+I=O ; 2x+y-10=O Find the area of the region bounded by the lines and x-axis. A 's salary is 20% less than B's and B's salary is 20% more than C's. If the sum of the salaries of A and B is Rs 5,400, then find the salary of C. Determine whether the system has a unique solution, no solution or infinitely many solutions. In case there is unique solution, find the solution. IS gx + —y = 22 2 6x + 5y = 11 and . Ria's tenth birthday is on 7th January 2008. In December 2018 she will reach half the average age of her parents. Her mother is 17 years elder than her. How old are the three on 30th December 2007? The area of a rectangle gets increased by 4m2 if its length is increased by 4m and breadth decreased by 2m . If the length is increased by 2m and breadth decreased by 2m , the area is decreased by 8m Find the dimensions of the rectangle. On selling a T.V. at 5% gain and a fridge at 10% gain , a shopkeeper gains Rs 2100. If she sells T.V. at 15% gain and fridge at 5% loss, he still gains Rs 1050 in the transaction. Find the original price of the T.V. and fridge. When 6 boys were admitted & 6 girls left the percentage of boys increased from 60% to 75%. 11. 12. 13. 14. Find the original no. of boys and girls in the class. A cyclist, after riding a certain distance, stopped for half an hour to repair his bicycle, after which he completes the whole journey of 30km at half speed in 5 hours. If the break down had occurred 10km farther off, he would have done the whole journey in 4 hours. Find where the breakdown occurred and his original speed. For what value of k, the following pair of linear equations has no solutions. = 2; -2y = 3. A boat can go 20km downstream and 30 km upstream in 3 hrs. It can go 20km downstream and 10 km upstream in 1— hrs. Find the speed of boat in still water and speed of stream. For what value of k, the following pair of linear equations has infinite many solutions. IOx + 5y — (k-5) = O; IOy-k= O.