To find out how many ripe bananas Belinda has, we need to calculate 3/8 of 40.
First, we can convert the fraction to a decimal by dividing the numerator (3) by the denominator (8):
3 ÷ 8 = 0.375
Next, we multiply the decimal by the total number of bananas (40) to find the number of ripe bananas:
0.375 x 40 = 15
Therefore, Belinda has 15 ripe bananas.