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TIMO - 2020 - Grade 7 - Preliminary Round - Paper 4 Question 1

TIMO · TIMO - 2020 - Grade 7 - Preliminary Round - Paper 4

Question 1

Given $A,D$ are two nonzero digits, the two-digit numbers formed by them satisfy:
1. $\overline{DA}$ is prime.
2. $\overline{AD}$ is the product of two primes greater than 5.
Find $\overline{DA}$.
  1. 91
  2. 19
  3. 53
  4. 35