3. 4 yr back, A's age was 4 times that B's age. What
is A's present age, if after 3 yr, B's age will be - rd
3
of A's age?
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The green plants and trees present in the forest utilize carbon dioxide from the environment during the process called photosynthesis and they release oxygen in the atmosphere. This oxygen is gasped by the animals during their respiration process.
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