Gina has 20 groups of 10 pencils 137 are sharpened how many dual pencils does Gina have

well, I think the whole group thing is ment to distract you. Math problems can be evil like that. If she has 200 pencils. and 137 ove them a sharp, you have to subtract 137 from 200. 200-137=23 : 3 she has 23 unshapened pencils.