please answer question no 13
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volume of 1 match stick= 4 ×2.5 ×1.5 cm
= 3.75 cube
so volume of 144 matches= 3.75 × 144
= 540 cm cube
volume of cartten= 1.5× 80× 60 cm cube
= 7200cm cube
so number of matchstick is equal to volume of one matchstick upon volume of curtain
= 3.75/7200
= 1920 MATCHSTICKS can be put in that curtain
= 3.75 cube
so volume of 144 matches= 3.75 × 144
= 540 cm cube
volume of cartten= 1.5× 80× 60 cm cube
= 7200cm cube
so number of matchstick is equal to volume of one matchstick upon volume of curtain
= 3.75/7200
= 1920 MATCHSTICKS can be put in that curtain
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