Question 395635
let B=total boys, G=total girls
boy's criteria:  equal number of brothers and sisters
girl's criteria: twice as many brothers as sisters
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if B=1 and G=1, this does not satify the conditions
if B=2 and G=1 satisfies boy's criteria but not sister's
if B=2 and G=2 does not satify the boy's criteria but satisfies sister's
if B=3 and G=2 satisfies boy's criteria but not sister's
if B=3 and G=3  niether condition satisfied
if B=4 and G=2  neither condition satisfied
if B=4 and G=3  satisfies both conditions