it's reported that most of the familie‘s ine is 3 times or more what it was 3 years ago为什么用what 而不是than
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这里的what引导的从句是跟在3 times后面的,or more是个补充说明,所以不是比较状语从句,不能用than,
3 times what it was three years ago“是3年前的3倍”.倍数的表达方式：times + 名词+ of,比如：His room is twice the size of mine.他的房间有我的2倍大,= his room is twice as big as mine.
例句中what 引导名词性从句,代替的就是上面我说的times后面跟的名词.
======以下答案可供参考======
供参考答案1:
据报导大多数家庭的收入是三年前的三倍或者更多，what指的就是收入的多少
供参考答案2:
it was 后面缺什么，缺“什么”吧，那就用what 呗