A recent survey of married couples in Indian metro cities showed that 20% of the couples have only child, 45% of the remaining couples have two children, and the rest of the couples have three or more children. What is the percentage of couples with three or more children?

Total 100
Couple with one child =20
Remaining child =100_20=80
Couple with two child =45%
Remaining =80×45/100=36
Couples with three or more children =80_36=44%

Consider there are 100 couples in total.
Now, 20 have 1 child.
45% of remaining, i.e. 45% of 80=36 have 2 children.
Out of total, there are 100-56= 44 couples with 3 or more children.
Thus, 44% couples have 3 or more children.

80*(55/100)=44

44%