20 is a multiple of 10
It is neither for 30.
Answer:
2. y = x + 16; 0.21y = 0.27x + 2.88
Step-by-step explanation:
You have two conditions:
- Volume of 18 % + volume of 27 % = volume of 21 %
- Mass of acid in 18 % + mass of acid in 27% = mass of acid in 21 %
For the first condition,
16 + x = y Transpose
(1) y = x + 16
=====
For the second condition
V₁c₁ + V₂c₂ = V₃c₃
16×0.18 + 0.27x = 0.21y
2.88 + 0.27x = 0.21y Transpose
(2) 0.21y = 0.27x + 2.88
The system of equations is y = x + 16; 0.21y = 0.27x + 2.88
So difference means subtract
x-y=0
product means multipy
x times y=25
we see from x-y=0 that x=y
so
x times y=25
x times x=25
what number times itself=25?
answer is 5
x=5
x=y
y=5
then numbers ae 5 and 5
