A roofing contractor has 29 bundles of roofing shingles that he needs to carry up a ladder and put onto a roof. He carries two bundles at a time. How many bundles are still on the ground after his 7th trip up the ladder?
hey thanks for all the answers 15 is the correct answer and i am not bad at math i just wanted to make sure because my classmates had diff. answers 
roofing contractor has 29 bundles, carries 2 bundles at a time , how many bundles on ground after 7 trip up ?
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