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Ana is a girl and has the same number of brothers as sisters. Andrew is a boy and has twice as many sisters as brothers. Ana and Andrew are the children of Emma. How many children does Emma have?1. 22. 33. 54. 7 |
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Answer» Correct Answer - Option 4 : 7 Given: Let boys = B and girl = G Therefore, Emma has = G + B children Ana is a girl and has the same number of brothers as sisters. Therefore,excluding Ana, G - 1 = B ........(1) Andrew is a boy and has twice as many sisters as brothers. Therefore, excluding Andrew, 2(B -1) = G 2B - 2 = G.........(2) By equation (1) and (2) B = 3 and G = 4 Hence, the number of children Emma have is 7. |
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