Asap! ! 1) how much water should we add to 35 kg of sugar syrup to change its concentration from 30% to 25%? 2) john can create 3 apps in 6 weeks while ben can do the same job in 2 weeks. how many weeks would it take them to create 10 apps together? 3)if 120% of a is equal to 80% of b, then what is the value of a+b? in terms of a? in terms of b?

See below

Step-by-step explanation:

1) Let us tabulate and see.

                    Sugar content      Water                  Total weight

I syrup          0.3(35) = 10.5      35-10.5 = 24.5          35

II syrup                            0                           x              x

total                               10.5              24.5+x             35+x

concentration in new syrup=

7kg of water should be added.

2) John can do 3/6 apps in one week while Ben can do 2/6 apps in one week.

Together they can do 5/6 apps per week.

Hence to do 10 apps they require 12 weeks.

3) 120% of a = 80% of b

i.e. 1.2a = 0.8b

Or 3a=2b

Or a:b = 2:3

By commendo and dividendo we get

a:a+b= 2:5

Or a+b = 5a/2 ... i

Next is

a+b:b =5:3

Or a+b= 5b/3

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)