a rope of length 3m 60 cm is cut into two pieces such that the ratio of the lengths of the pieces is 7:5. find the length of the larger pieces

So the solve the answer-
3 m 60 cm= 360 cm
360/(7+5)
=360/12
=30cm for 1 unit 
So length of the first and longer piece= 30*7=210 cm
And the length of the second and shorter piece= 30*5=150 cm
Ans. The length of the longer piece was 210 cm and the length of the shorter piece was 150 cm.
Hope it Helps.