Library / /94 of 122

, 2021

Number theory Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

There are 20 questions in a quiz. Seven points are awarded for each correct answer, four points are deducted for each incorrect answer and no points are awarded or deducted for each question left blank. Erica took the quiz and scored 100 points. How many questions did she leave blank?

(A) $0$ (B) $1$ (C) $2$ (D) $3$ (E) $4$

Want a route through all this instead of an archive? The track puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.

Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.