The sum of the digits of a two-digit number is 9. If 27 is added to it, the digits of the number get reversed. The number is

The father’s age is six times his son’s age. Four years hence, the age of the father will be four times his son’s age.
The present ages of the son and the father are, respectively

\(
\text { The value of } \mathrm{k} \text { , for which equations } 3 \mathrm{x}+5 \mathrm{y}=0 \text { and } \mathrm{kx}+10 \mathrm{y}=0 \text { has a non-zero solution is }
\)

\(
\text { If } a m b \mid \text { then the system of equations } a x+b y=c, l x+m y=n, \text { has }
\)

If a pair of linear equations is consistent, then the lines are:

\(
\text { The pairs of equations } 9 x+3 y+12=0 \text { and } 18 x+6 y+26=0 \text { have }
\)

Gita can row downstream 20 km in 2 hours, and upstream 4 km in 2 hours. Her speed of rowing in still water and the speed of the current is:

\(
\text { The pair of equation } x=-4 \text { and } y=-5 \text { graphically represents lines which are }
\)

\(
\text { The graph of } y=4 x \text { is a line }
\)

Asha has only ₹1 and ₹2 coins with her. If the total number of coins that she has is 50 and the amount of money with her is ₹75,
then the number of ₹1 and ₹2 coins are, respectively