Answer:
To determine how many cakes Jahnay is making, we need to calculate the total weight of the ingredients for one cake and then divide the total amount of flour Jahnay is using by that amount.
First, let's calculate the total weight of ingredients for one cake:
150 g sugar + 120 g butter + 210 g flour + 2 eggs = 480 g
Next, let's divide the total amount of flour Jahnay is using by the total weight of ingredients for one cake:
840 g / 480 g = 1.75 cakes
So Jahnay is making 1.75 cakes.