What’s For Lunch? The answer
The total peanut butter on 1500 sandwiches is 1500 x 2 = 3000 ounces.
At 18 oz each, that's equal to 3000 / 18 = 166.67 jars of peanut butter.
Since it takes 864 peanuts to make a jar, 864 x 166.67 = 144,003 peanuts
(rounded to the nearest whole number) are needed to make all of those
sandwiches.
Or, you can look at how many peanuts are needed to make each sandwich.
864 peanuts per 18 ounces would give a unit rate of 864 18 or 48 peanuts per
ounce. Since each sandwich requires 2 ounces of peanut butter, that would be
48 X 2 = 96 peanuts per sandwich. Then multiply 96 X 1500 = 144,000.
Either way, you would need about 144,000 peanuts to make all of those
sandwiches.