A class has 90 students. If the ratio of boys and girls is 7:8, find the number of boys in the class ?
A. 23
B. 76
C. 93
D. 42
Ratio and proportion
Ratio and proportion questions with answers and explanations. Types of ratio and proportion: golden proportion, proportions in math, basic ratio and proportion
Ratio of boys and girls in a class was 11:13. 8 girls and 4 boys join the class from this academic year and the ratio becomes 4:5. Find the strength of the class ?
A. 108
B. 67
C. 96
D. 34
Perimeter of a triangle is 81 cm. If the sides are in the ratio 4:3:2, find the length of the largest side ?
A. 27 cm
B. 36 cm
C. 45 cm
D. 40 cm
M:N = 3:4, N:O = 5:7 and O:P = 7:9. Then M:P = ?
A. 5/12
B. 1/6
C. 1/3
D. 7/9
Length and breadth of a rectangle are in the ratio 5:4. Find its perimeter if its area is 180 cm² ?
A. 98 cm
B. 12 cm
C. 54 cm
D. 27 cm
Plan for a rectangular area is drawn to a scale of 1:500. If the length and breadth in the plan is 30 cm and 20 cm, find the actual area ?
A. 12000 m²
B. 15000 m²
C. 1200 m²
D. 1500 m²
Ratio of two numbers a and b is 3:5. If 2 is added to both the numbers, the ratio becomes 2:3. Find bv.
A. 12
B. 7
C. 10
D. 5
If X:Y = 2:3, Y:Z = 4:5. Find X:Y:Z .
A. 8:12:15
B. 2:7:5
C. 2:3:5
D. 2:8:5
Find the mean proportion between 5 and 45 .
A. 25
B. 45
C. 5
D. 15
A bag contains 50 paise, 1 rupee and 2 rupee coins in the ratio 2:5:8. If the total amount is Rs. 352, find the total number of coins in the bag ?
A. 250
B. 240
C. 160
D. 200