Two numbers are in the ratio 3 : 5. If each is increased by 10, the ratio becomes 5 : 7. The numbers are :

A 3, 5
B 12, 20
C 15, 25
D 30, 42

Correct Answer: 15, 25

Let the ratio of the numbers be 3x and 5x . If each number is increased by 10 . then , (3x + 10)/(5x + 10) = 5/7 or, 21x + 70 = 25x + 50 or, 21x - 25x = 50 - 70 or, - 4x = - 20 or, x = 5 . so, Numbers are 15 and 25
Bissoy MCQ
#গণিত #অনুপাত-সমানুপাত (Ratio-Proportion) #শতকরা (Percentage) #United Commercial Bank Ltd (UCB) #United Commercial Bank Ltd - Officer - 13.08.2010

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