What is the numerical expression of the sum of 3 fifteens and 4 twos and the model of it

When you say something like "three fifteents", you means that you have to consider the number 15 three times, so you're implicitly talking about multiplications.

So, "3 fifteens" means and in the same fashion "4 twos" means

Finally, "and" implies a sum, so the expression would be

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70