Book Maths Puzzle Algebra

Andy wanted to paint his house. To begin with, he removed his 3 digit house number. He noticed that the sum of the digits was 8 and that the hundreds was two times as large as the

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Using 7 four times can you get that to add up to 100 using any operation or any math symbol A rancher has 360 m of fencing with which to enclose two adjacent rectangular corrals. a river forms one side of the corrals.

what is the total area of the two corrals as a fun