Question

It takes 17 full specific types of trees to make one ton of paper. If there are 221 such trees in a forest then, (i) what fraction of the forest will be used to make;
(a) 5 tons of paper. (b) 10 tons of paper.
(ii) to save 7/13 part of the forest how much of paper we have to save.

Answer 1

17 trees = 1 tonne paper1 tree=117 tonne paper .Total number of trees in a forest =221 trees .Trees to save=713×Total number of trees in a forest=713×221=7×17=119 trees .Paper we have to save=117×119=7 tonne paper .7 tonne of paper we have to save .
 

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Answer 2

Answer:

(a) Fraction of the forest will be used to make 5 tons of paper is 5/13

(b) Fraction of the forest will be used to make 10 tons of paper is 10/13

(ii) Seven tons of paper needed to be saved, to save 7/13 part of the forest.

Step-by-step explanation:

We have given,

17 trees used to make paper = 1 ton

Total number of tress in the forest = 221

(a) Five tons of paper:

Trees required to produce 1 ton paper = 17

For 5 tons of paper , trees required = 17×5 =85 trees.

If 221 trees present in the entire forest,

85 trees used to make 5 tons paper cover trees  $=\frac{85}{221}$

85 trees cover the fraction of forest $=\frac{5}{13}$

(b) 10 tons of paper :

For 10 tons of paper , trees required = 17×10 = 170 trees.

If 221 trees present in the entire forest,

170 trees used to make 10 tons paper cover trees  $=\frac{170}{221}$

170 trees cover the fraction of forest $=\frac{10}{13}$

(c) To save 7/13 part of the forest, we have to save amount of paper :

7/13 part of the forest have trees $=\frac{7}{13} *221 =119$

Now, if 17 trees give amount of paper = 1 ton

119 trees will make amount of paper  $=\frac{119}{17}=7\;ton$

Therefore, we have to save seven tons of paper to save 7/13 part of forest.