Dang this is too much to read i nearly understand the question
1) 3.8x + 5.2x - 6.7 = 11.3
9x = 11.3 + 6.7
9x = 18
x = 18/9
x = 2
2) 7.8y - 4.9 - 5.4y = 2.3
2.4y = 7.2
y = 7.2/2.4
y = 3
3)



Multiply by 3 by both sides:

Simplify:
2x = 18
x = 18/2
x = 9
4)

Do lowest common denominator:



Simplify by 5 by both sides:


Answer:
14
Step-by-step explanation:
X+3x+5x=27
x=27/9=3
youngest one is 3 years old.
Answer:
In this question the value of x is 45.
Step-by-step explanation:
given that :
x/5-7=2 and x=?
solve : x/5-7=2
x-7(5)/5=2 taking L.C.M
x-35/5=2
x-35=2*5 multiply by 5
x-35=10
x=10+35
x=45.