So using whole number rounding I believe the answer you should get would be 141,550 as 3217 x 44 is equals to 141,548 so the answer may be 141,550 since 50 is the closest ten number to 48, with a distance of only 2 numbers.
Step-by-step explanation:
2x-21+6=x-3
18 shells because since Mary has 6 and Tina has 3 shells all you have to do is multiply 6 and 3 to get 18