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(a) lenght of ribbon used for 15 small parcels and 6 large parcel was 2100 cm ,

If length of ribbon required for a small parcel is 3u, length of ribbon used for a big parcel is 5u.

15 * 3u / 5u = 9

9 large pracel s can be tied with length used for 15 small parcels.

(b))

15 * 3u + 6 * 5u = 2100

45u + 30u = 2100

75u = 2100

u = 28 

Length of ribbon needed for the remaining parcels

= (18 – 15)* 3 * 28 + (14 – 6) * 5 * 28

= 1372 cm

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