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Gaurav Seth 6 years, 6 months ago
Take help from the similar question:
A number consists of two digits whose sum is 9.if 27 is subtracted from the number,its digits are reversed . find the number
Solution:
Let us assume, x and y are the two digits of the two-digit number
Therefore, the two-digit number = 10x + y and reversed number = 10y + x
Given:
x + y = 9 -------------1
also given:
10x + y - 27 = 10y + x
9x - 9y = 27
x - y = 3 --------------2
Adding equation 1 and equation 2
2x = 12
x = 6
Therefore, y = 9 - x = 9 - 6 = 3
The two-digit number = 10x + y = 10*6 + 3 = 63
Posted by Harshini Hiranmayi 6 years, 6 months ago
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Sia ? 6 years, 6 months ago
Closure property for addition : If a and b are two whole numbers and their sum is c, i.e. a + b = c, then c is will always a whole number.
Posted by Manju Joshi 6 years, 6 months ago
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Sia ? 6 years, 6 months ago
Check revision notes here : <a href="https://mycbseguide.com/cbse-revision-notes.html">https://mycbseguide.com/cbse-revision-notes.html</a>
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Biodegradable Waste
These kind of waste products are broken down by the action of micro-organisms like Bacteria. This kind of waste decay and Decompose naturally and become harmless after some time. Biodegradable Waste Examples are Cattle Dung, Tea leaves, Wood, Grass, Fruit & Vegetables, Paper, Animal Bones. These turn into compost after decaying and act as Natural Fertilizers. They do not normally Pollute the Environment, but if present in a large quantity, those that cannot be Decomposed can pollute the Environment.
Non-Biodegradable Waste
These substances or type of waste material, (non-poisonous and harmless substances)cannot be broken down into a simpler form, they cannot be decomposed. Non-Biodegradable waste examples are Plastics, Ball Point Pen Refill, Polythene Bags, Glass Objects, Aluminum Cans, Iron Nails, Foil paper, Radioactive waste, to name a few.
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Meghna Thapar 5 years, 10 months ago
Hybridisation – It involves the crossing between genetically dissimilar plants to produce a new kind. Crossing may be between two different varieties (intervarietal cross - breeding) or between the two different species of the same genus (inter specific cross – breeding) and between different genera (intergeneric cross – breeding).
Crop
Improved Variety
Rice
Maize
Soyabean
Sunflower
Mustard
IR8
Ganga 5
PK 262
BSH 1
Pusa Bold
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