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Ratio and proportion

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Q. 1. If a : b = 7 : 9 and b : c =15 : 7, then what is a : c A) 5 : 3 B) 3 : 5 C) 7 : 21 D) 7 : 15 Q. 2. ₹ 6200 is divided into three parts proportional to 1/2 : 1/3 : 1/5 are respectively A) ₹3000, ₹2000, ₹1200 B) ₹3500, ₹1500, ₹1200 C) ₹2500, ₹2000, ₹1700 D) ₹2200,  ₹3000,  ₹1000   Q. 3. The ratio of A to B is 4 : 5 and that of B to C is 2 : 3.If A equals 800,C equals A) 1000 B) 1200 C) 1500 D) 2000 Q. 4. If A = 4/5 of B and B = 5/2 of C, then the ratio of A : C is  A) 1 : 2 B) 2 : 1 C) 2 : 3 D) 1 : 3 Q. 5. If 2A=3B=4C, then A:B:C is A) 2 : 3 : 4 B) 4 : 3 : 2 C) 6 : 4 : 3 D) 3 : 4 : 6 Q. 6. If (3x + 5)/(5x - 2) = 2/3, then the  value of x is  A) 11 B) 19 C) 23 D) 7 Q. 7. What must be added to each term of the ratio 2 : 5 so that it may equal to 5 : 6 ? A) 65 B) 78 C) 13 D) 12 Q. 8. If x/y = 3/4, the ratio of (2x +3y) and (3y - 2x) is A) 2 : 1 B) 3 : 2 C) 1 : 1 D) 3 : 1 Q. 9. Two numbers are in the ratio 4 : 5 and their L.C.M. is 180. The smaller numb...
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Important Formulas of Maths

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                        Key Points and Useful Formulas for Exams       Important Formulas For Board Exams                                                            Number system  Prime numbers - A prime number is defined as a number that has no factor other than 1 and itself. Co-prime numbers - co-primes are considered in pairs and two numbers are co-prime if they have no common factors other than 1. Twin prime numbers - Twin prime numbers are the prime numbers whose difference is always equal to 2. For example, the difference between 5 and 7 is 2, and hence 5 and 7 are twin prime numbers. Composite numbers -  All the natural numbers which are not prime numbers are composite numbers as they can be divided by more than two numbers.  HCF an...
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