Level 3
There is a 4-digit number. The digit in the hundreds place is thrice the digit in the ones place. The digit in the thousands place is the smallest even number. The sum of all the digits is 21. What is the number?
Level 3
Mr Lim has three pieces of rope of length 80 cm, 140 cm and 180 cm. He wishes to cut the three pieces of rope into smaller pieces of equal length with no remainder.
What is the greatest possible length of each of the smaller pieces of rope?
How many of the smaller pieces of rope of equal length can he get?
Natasha had some T-shirts that she wanted to donate. 3 of them were torn and she had to throw them away. She then packed them equally into boxes. Each box could either contain 6 or 7 T-shirts. What is the smallest possible number of T-shirts Natasha had at first?