You just have to imagine it as a rectangle, with a square.
The rectangle inside is 18" by 8".
The square, made of the outside two triangle pieces, is 8" by 4". (Yes, I know it isn't really a square.)
Area = length x width.
A1 = 18 x 8
= 144.
A2 = 8 x 4
= 32.
A1 + A2 = 176 square inches.
Answer:
4:10
24:60
48:120
As long as you multiply or divide both sides of the ratio by the same number, you will have an equivalent ratio.
All right with 1 sandwich u have this as your work 1 x #soup x#drink which looks like this 1 x 2 x 5 which =10 now we have 4 sandwiches so it looks like this 4 x 2 x 5 which =40
Ask a teacher or look it up or use a text book
For compound interest questions know the formula , after that just substitute accordingly
if the question is asking for the interest , do not forget to subtract off the amount you started with