Let’s start by defining 60 + 20:
60 + 20 = 80
Now, let’s see what equation doesn’t match 80:
10(6 + 2) = 60 + 20 = 80
A is incorrect; it matches 80.
5(12 + 4) = 60 + 20 = 80
B is incorrect; it matches 80.
2(30 + 10) = 60 + 20 = 80
C is incorrect; it matches 80.
That leaves D, but let’s solve it to prove:
10(6 + 1) = 60 + 10 = 70
D is correct; 70 will never be equivalent to 80.
The expression 10(6 + 1) is not equivalent to 60 + 20.