Question

A space of 3m×1.5 m is cut froma wooden wall of dimension 14×8m an iron plate needs to be fixed all around the woodenwall to protect it from moisture.fi d the length of the iron plate. and also fknd the cost of polishing the wall at the rate of rs.375 per sq. m

Answer 1

2 no. the ratios are 3:5
if each is increased by 10, the ratio between new no. so formed is 5:7
find the original numbers.
:
let x be the multiplier

3x= one no.
5x= the other no.

:
"If each is increased by 10, the ratio between the new numbers so formed is 5:7."

=
Cross multiply
5(5x+10) = 7(3x+10)
:
25x + 50 = 21x + 70
25x - 21x = 70 - 50
4x = 20
x = 20/4
x = 5 is the multiplier
then
3(5)= 1st no.
5(5)= 2nd no.