First, start off by listing a few of the numbers that follow the first three clues to see if you can narrow it down. 7,111,111 7,333,333 7,555,555 etc. Then, start adding up digits to see if you're getting close. 7+1+1+1+1+1+1 = 13 7+3+3+3+3+3+3 = 25 7+5+5+5+5+5+5 = 37 Since 7,555,555 is too high, we step it down to 7,555,333 7+5+5+5+3+3+3 = 31 7,555,333 will work as an answer, as well as 7,333,555, since it's the same amount when the digits are added together.
the area of the larger square is 36 (6*6), and the area of the smaller square is 16 (4*4). to find the ratio of the area, simply just put 16 over 36 and simplify.
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