Answer:

Step-by-step explanation:
Let
y --->Mala's age
x---> sister's age
we know that
---> equation A
so
The sum of ages of the sisters is

substitute equation A in the expression of the sum of ages

simplify

x = 72
Step-by-step explanation:
The answer is D because 32+21= 53
so 53+33+14= 100
hope this helps :)
Estimate:6000
You can use distributive property