PSLE
Pupils participating in a test must obtain at least a certain score in the first round to qualify for the next round. There were 95 pupils in the first round and the table shows the number of pupils for each score. 80% of the pupils did not qualify for the next round. From the table, what was the lowest score of a pupil who qualified for the next round?

Score	Number of pupils
0	10
10	16
20	22
30	28
40	17
50 or more	2

Score	Number of pupils	Status
0	10	80% of pupils did not qualify
10	16
20	22
30	28
40	17	20% of pupils qualified
50 or more	2

Percent of pupils who qualified for the next round
= 100% - 80%
= 20%

Number of pupils who qualified for the next round
= 20% of pupils
= ²⁰₁₀₀ x 95 
= 19

Number of pupils who score 50 or more = 2
Number of pupils who score 40 or more = 2 + 17 = 19

Lowest score of a pupil who qualified for the next round = 40

Answer(s): 40