do Four fifth of a number is greater thanthree fourth of a number by 4. Find the number.
1 The sum of 2 consecutivo multiples of 3 16 09. Find them
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15. OKg of an Alloy of Lead and tin contains 40% of Lead. How much lead be melted into to
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16) In an isosceles triangle the base angles areequal and the vertex angle is thrice of each
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17. The length of a rectangle is 4 times its width and its perimeter is 96m. Find the length and,
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Find their present ages.
19. How much pure Alcohol must be added to 500ml of a 20% solution to make it's strength
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20. A labourer is engaged for 20 days on the condition that he will receive Rs 120 for each
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Answer:
Let the required number be 'x', then four fifths of the number =
5
4
x
And three fourths of the number =
4
3
x
It is given that
5
4
x is greater than
4
3
x by 4
⇒
5
4
x−
4
3
x=4
20
16x−15x
=4
⇒
20
x
=4 ⇒ x=80
hence the required number is 80.
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