Wendy bought 13 blue balloons and 16 red balloons for the party. Later she bought 15 green balloons and 17 white balloons. How many balloons are there in all?

Hint:

In this question, we are given the number of blue and red balloons Wendy bought initially for the party and the number of green and white balloons Wendy bought later. We are required to find the total number of balloons. For that, we simply need to find the sum of all the blue and red balloons.