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Class 9Y-1 from Downend School sent us the correct solution and showed that it satisfied the criteria:
The five coins are 1p, 10p, 10p, 20p, 20p.Similar solutions were sent by Kate and Hannah from Marist College in New Zealand; students from Wingham Primary School; James from Wellington School; Can, Jack and Lee from Ashmount Primary School; Patrick and Natalie also from Ashmount Primary School; Thomas, Jack, Jim, Jenny and Timothy from Bay House School; Tasmin from St. Pauls; Kirsty from Herts and Essex High School; Levi from Greenwood Junior School; Tommy from St Mary's Hall, Lincoln and Jaehyung from ACS Egham International School, and Daniel from Ysgol Dyffryn Dulas Corris.
Jae explained his reasoning:
The first clue I used was: He can not make exactly 70p.Alex from Bristol Grammar School also explained his reasoning:
A 1p coin, two10p coins, two 20p coins. A 1p coin is needed to make the prime number above 10 and the rest must be mutliples of 10 so that the final digit does not change. The 10 and 20 p coins were chosen through system of elimination.Sammy & Lucy from Hove Park School also showed that their solution satisfied all the criteria:
A Man has 5 Coins and his coins are 10p, 10p, 20p, 20p, 1pWell done to you all.