Question

In what ratio should ram mix two varities of barley costing rs 20 and rs 24 per kg so that by selling it at rs 27.60 per kg makes a profit of 20%?

Answer 1

120%= 27.60
100%= 27.60 ×100÷120
=23

now use method of alligation
20 .......24
\.......... /
\ ......./
23
/ \
------------------
1 .......3

so ratio = 1:3