Question

A fraction becomes 9/11 if 2 is added to both numerator and denominator. If 3 is added to both numerator and denominator it becomes 5/6. find the fraction.

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Answer 1

Answer:

Let the fractio = x / y

then (x+2)/(y+2)=9/11

11x+22=9y+18

11x-9y=-4………………………….(1)

Also x+3/y+3=5/6

6x+18=5y+15

6x-5y=-3………………………..(2)

Multiplying (1) by 5 and (2) by 9 and subtracting we get

55x-54x=-4*5-(-3*9)

x=7

thy from(1)

77-9y=-4

7y=81,y=9

thus the fraction is : 7/9

Answer 2

Answer:

Respiratory muscles

The diaphragm is attached to the base of the sternum, the lower parts of the rib cage, and the spine. As the diaphragm contracts, it increases the length and diameter of the chest cavity and thus expands the lungs. The intercostal muscles help move the rib cage and thus assist in breathing.