Answer:
You bought 5 pounds of bananas
Step-by-step explanation:
Firstly, we assign variables.
Let the number of pounds of bananas bought be b and the number of pounds of apple bought be a .
One more pound of apples than bananas were bought.
Mathematically this means a - b = 1 or a = b+ 1 .........(i)
The total cost of apples bought is 3.4 * a = $3.4a
The total cost of bananas bought is 2.30 * b = $2.30b
Now the addition of both equals $31.90
Thus, we have;
3.4a + 2.3b = 31.9 •••••••••(ii)
From i, we can substitute for a
3.4(b+1) + 2.3b = 31.9
3.4b + 3.4 + 2.3b = 31.9
5.7b + 3.4 = 31.9
5.7b = 31.9 - 3.4
5.7b = 28.5
b = 28.5/5.7
b = 5 pounds
