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ICSE Worksheet for Chapter - 4 Ratio Proportion Class 8

Worksheets For class 8

Find ICSE Worksheet for chapter-4 Ratio Proportion class 8

  1. CLASS-8
  2. BOARD: ICSE
  3. Mathematic Worksheet - 4
  4. TOPIC: Ratio Proportion
  5. For otherICSE Worksheet for class 8 Mathematic check out main page of Physics Wallah.

SUMMARY:

  • Compounded Ratio: The compounded ratio of the ratios (a:b), (c:d) and (e:f) is (ace:bdf).
  • Duplicate Ratio: The duplicate ratio of (a:b) is (a2:b2)
  • Sub-Duplicate Ratio: The sub-duplicate ratio of (a: b) is (√(a ): √(b ) )
  • Triplicate Ratio: The Triplicate ratio of (a:b) is (a3:b3)
  • Sub-Triplicate Ratio: The sub-triplicate ratio of (a: b) is (a(1/3) ∶ b(1/3))
  • Componendo: If a/b=c/d then, the componendo is (a+b)/b=(c+d)/d.
  • Dividendo: If a/b=c/d then, the dividendo is (a-b)/b=(c-d)/d.
  • Componendo - Dividendo: If a/b=c/d then, the componendo - dividendo is (a+b)/(a-b)=(c+d)/(c-d).

EXERCISE:

  1. Find out:
    1. the fourth proportional to 4, 9, 12;
    2. the third proportional to 16 and 36;
    3. the mean proportional between 0.08 and 0.18
  2. If x:y=3:4, find (4x+5y):(5x-2y)
  3. Divide Rs. 1162 among A, B, C in the ratio 35:28:20
  4. A bag contains 50p, 25p and 10p coins in the ratio 5:9:4, amounting to Rs.206. Find the no. of coins of each type.
  5. If 1/5:1/x=1/x:1/125 , then the value of x is:
    1. 15
    2. 20
    3. 25
    4. 35
  6. If x:y=5:2 then (8x+9y):(8x+2y)
    1. 22:29
    2. 26:61
    3. 29:22
    4. 61:26
  7. Two numbers are respectively 20% and 50% more than a third number. The ratio of the two numbers is:
    1. 2:5
    2. 3:5
    3. 4:5
    4. 6:7
  8. The ratio of the number of boys and girls in a college is 7:8. If the percentage increase in the number of boys and girls be 20% and 10% respectively, what will be the new ratio?
    1. 8:9
    2. 17:18
    3. 21:22
    4. cannot be determined
  9. What is the ratio whose terms differ by 40 and the measure of which is 2/7?
    1. 16:56
    2. 14:56
    3. 15:56
    4. 16:72

Solutions: to worksheet-4 Topic- Ratio Proportion  

    1. 27 ;
    2. 81;
    3. 0.12
  1. 32/7
  2. A = Rs.490; B = Rs. 392; C = Rs.280
  3. 50p=200; 25p=360; 10p=160
  4. (c)
  5. (c)
  6. (c)
  7. (c)
  8. (a)

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