Since z varies jointly as x and y, the value of z when x = 7 and y= 8 is; 112
According to the question, z varies jointly with X and y.
- In essence, the relationship between z, x and y can be written as;
z = kxy
- where k= constant of proportionality.
We therefore need to find k first, from the first set of values of z, ,x and y.
Then;
Consequently, the value of z when x = 7 and y = 8 is as follows;
z = 112.
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Let the x ml of water be mixed with 237 ml of ammonia whose strength is 100%, in order to create a mixture of 75% strength.
The equation required to solve this will be:
237/(237+x)=75/100
solving for x we get:
237/(237+x)=3/4
237×4=3(237+x)
948=711+3x
3x+711=948
3x=948-711
3x=237
x=237/3
x=79 ml
therefore the amount of water to be added will be 79 ml
Well you have 6 because like u took that percent arebhfg
Answer:
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