11z/16+7z/8=5/16
(11z+14z)/16=5/16
25z=5
z=5/25=1/5
Step-by-step explanation:
x = father's age now
y = son's age now
x = 2y + 10
x - 20 = 5(y - 20) = 5y - 100
using the first in the second equation :
2y + 10 - 20 = 5y - 100
-10 = 3y - 100
90 = 3y
y = 30
x = 2y + 10 = 2×30 + 10 = 60 + 10 = 70
the father is now 70 years old, the son now 30 years old.
Answer:
When two quantities increase or decrease together they are said to be directly. proportional
Answer:
sorry i dont know
Step-by-step explanation:
68°+52°=120 and a triangle is 180° so 180-120=60 so x=60
shortest to greatest 52, 60, 68
