Question

the height of a student in creases in the ratio 3 : 4 the height at present is 120cm , what is the new height​

Answer 1

Step-by-step explanation:

hight is 3x and 4x

1 cm is 1000m

so 120cm is 120000

now x is

3x+4x=120000

x(3+4+1x)=120000

3x+4x+2x is 120000

7x+2x=120000

9+2x=120000

2x=120000-9=119991-2=19989

2x= 19989

x=19989÷3=3996.3

x=19989÷5=23997.8

23997.8-3996.3=