1.

In a hall, there are 396 children who have 5 marbles and there are 230 children who have 7 marbles. 198 children with 5 marbles each and 225 children with 7 marbles each are taken to a second hall. What will be the ratio of number of marbles in second hall to that in first hall?1). 170 : 1292). 231 : 1123). 471 : 1914). 513 : 205

Answer»

There are 396 CHILDREN with 5 MARBLES. If 198 children with 5 marbles move to second hall, there will be 198 children left in FIRST hall with 5 marbles.

⇒ Number of marbles in second hall = (225 × 7 + 198 × 5)

⇒ Number of marbles in first hall = (198 × 5) + (5 × 7)

∴ Ratio of number of marbles in second hall to that in first hall = (225 × 7 + 198 × 5)/ (198 × 5) + (5 × 7)

⇒ 2565/1025 = 513 : 205


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