Question

X got 15 marks less than Y and Y got 5 marks more than Z. if the sum of their mark is 112 then how many mark Z get


explain it in detail please ​

Answer 1

Answer:

39

Step-by-step explanation:

Let marks of X=x;

Let marks of Y=y;

Let marks of Z=z;

Lets relate all values to y i.e marks of Y

x=y-15           //X got 15 marks less than Y      //equation 1

z=y-5           //Y got 5 marks more than Z      //equation 2

Total=112     //sum of their mark is 112

x+y+z=112

Using equation 1 and 2

y-15+y+y-5=112

3*y-20=112

3*y=132;

y=132/3

y=44;

Now z=y-5 Using equation 1

z=44-5

z=39

Hope its helps

Answer 2

Y=X-15

Z=(X-15)+5

if x+y+z,=112

x+x-15+x-10,=112

3x-25=112

3x=112+25

X=137,,÷3

45.6

z=35.6