Final answer:
The GCF (Greatest Common Factor) of 10t and (20t + 15t) is 5t.
Step-by-step explanation:
The GCF (Greatest Common Factor) of 10t and (20t + 15t) can be found by factoring the terms. Let's start by factoring 10t.
10t = 2 * 5 * t
Next, let's factor (20t + 15t).
20t + 15t = 35t
Now, let's find the common factors between 2 * 5 * t and 35t. The common factors are 1, 5, and t. Therefore, the GCF of 10t and (20t + 15t) is 5t.
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