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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?

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? Correct Answer 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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