If a/(a+b) = 15/21, what is (a+b)/(a-b) is equal to? 13/9 23/11 14/5 21/9 a/(a +

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Question
If a/(a+b) = 15/21, what is (a+b)/(a-b) is equal to?
Options
A. 13/9
B. 23/11
C. 14/5
D. 21/9

Correct Answer

21/9

Explanation

a/(a + b) = 15/21 ? a = 15, a + b = 21

? b = 21? 15 = 6
? a ? b =15 ? 6 = 9
? (a + b)/(a ? b) = 21/9

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1. If a--b = 4 and ab = 45, find the value of a3 - b3
Options
A. 604
B. 370
C. 253
D. 199

Discuss

Correct Answer: 604

Explanation:

${(a ? b)}^{2} = a^{2} + b^{2} - 2 ab ? 16 = a^{2} + b^{2} ? 90 ? a^{2} + b^{2} = 106 a^{3} ? b^{3} = (a ? b) (a^{2} + b^{2} + ab) ? a^{3} ? b^{3} = 4 X (106 + 45) ? a^{3} ? b^{3} = 4 X 151 ? a^{3} ? b^{3} = 604$

2. The number whose square is equal to the difference of the squares of 37 and 23 is:-
Options
A. 45.09
B. 28.98
C. 47.09
D. 28

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3. If a sum of money deposited in a bank at simple interest is doubled in 6 years, then after 12 years, the amount will be
Options
A. 5/2times the original amount
B. 3times the original amount
C. 7/2times the original amount
D. 4times the original amount

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7. If x varies as y and x = 8 when y = 15 then the value of x when y = 10 is:
Options
A. 5
B. 15/8
C. 8/15
D. 16/3

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9. In a school there are 1500 students, 44% of them are girls. Monthly fee of each boy is 540 and fee of each girl is 25% less than that of a boy. The sum of fees of boys & girl is
Options
A. Rs. 720600
B. Rs. 720800
C. Rs. 720900
D. Rs. 721000

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If a/(a+b) = 15/21, what is (a+b)/(a-b) is equal to?

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If a/(a+b) = 15/21, what is (a+b)/(a-b) is equal to?

Simplification problems

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