Level 3
Jim has 5 green marbles and some red marbles. Then his sister gave him 2 more red marbles and he has a total of 10 marbles. How many red marbles did he have at first?
Level 3
I am a 4-digit number. The digit in the hundreds place is 6 less than the ones place. The digit in the tens place is 3 more than the thousands place. Which of the following numbers am I?
5288, 2523, 5427