Question : In a school library, the ratio of Science to English books is 10 : 13. If there are 400 science books and due to an increase in demand for Science books, few Science books are added by school authority and the ratio becomes 25 : 26. What is the number of Science books added?

Option 1: 50

Option 2: 100

Option 3: 120

Option 4: 80

Question : The angles of a triangle are in the ratio 2 : 3 : 4. What is the largest angle of the triangle?

Option 1: $80^{\circ}$

Option 2: $100^{\circ}$

Option 3: $90^{\circ}$

Option 4: $120^{\circ}$

Question : The ratio of two numbers is 5 : 9. If 6 is added to the greater number and 6 is subtracted from the smaller number, the greater number becomes 6 times the smaller number. What are the numbers?

Option 1: 15 and 17

Option 2: 10 and 18

Option 3: 25 and 45

Option 4: 20 and 36

Question : The length and the breadth of a rectangle are increased by 15% and 10%, respectively. What is the percentage increase in the area of the rectangle?

Option 1: 25%

Option 2: 26.5%

Option 3: 27.5%

Option 4: 26%

Question : The students in three classes are in a ratio of 3 : 7 : 8. If 6 students are increased in each class, the ratio changes to 11 : 23 : 26. Find the total number of students in the three classes before the increase.

Option 1: 162

Option 2: 112

Option 3: 90

Option 4: 144

Question : What is the value of $\frac{25 \times 25-12 \times 12+13 \times 13}{12 \times 5+10 \div 2}$?

Option 1: 10

Option 2: 5

Option 3: 65

Option 4: 13