1 Choice A is correct
The correct answer is \(30\) cm\(^2\) There are \(6\) shaded squares. Then: \(6 \ × \ 5\) cm\(^2 =30\) cm\(^2\)

2 Choice C is correct
The correct answer is \(1.5\) \(\frac{8}{2} \ \ \frac{5}{2}=\frac{3}{2}=1.5\)

3 Choice E is correct
The correct answer is \(80\) \(\frac{x}{8} \ + \ 5=15→\) \(\frac{x}{8}=15 \  \ 5=10→\) \(\frac{x}{8}=10→\) \(x=10 \ × \ 8=80\)

4 Choice C is correct
The correct answer is \(7\) \(50=5 \ × \ N \ + \ 15→\) \(5 \ N=50 \  \ 15=35→\) \(N=7\)

5 Choice D is correct
The correct answer is \(3 \ N \ + \ 5=27\) \(5 \ + \ (3 \ × \ N)=27→\) \(3 \ N \ + \ 5=27\)

6 Choice A is correct
The correct answer is \(1,350\) \(1,800 \  \ 450=1,350\)

7 Choice C is correct
The correct answer is \(60\) \(25\) percent of \(240=\frac{25}{100} \ × \ 240=\frac{1}{4} \ × \ 240=\frac{240}{4}=60\)

8 Choice D is correct
The correct answer is \(45\) degrees All angles in a triangle sum up to \(180\) degrees. The triangle provided is an isosceles triangle. In an isosceles triangle, the three angles are \(45, \ 45\), and \(90\) degrees. Therefore, the value of \(x\) is \(45\).

9 Choice A is correct
The correct answer is \(61\) The ratio of red marbles to blue marbles is \(5\) to \(3\). Therefore, the total number of marbles must be divisible by \(8\). \(5 \ + \ 3 = 8\) \(61\) is the only one that is not divisible by \(8\).

10 Choice A is correct
The correct answer is \(7\) \(78\) divided by \(5\), the remainder is \(3\). \(45\) divided by \(7\), the remainder is also \(3\).

11 Choice D is correct
The correct answer is \(y \  \ 2\) Emily's Money \(=y\) Jack's Money \(=y \ + \ 12\) Jack gives Emily \($14→y \ +\ 12 \  \ 14= y \  \ 2\)

12 Choice A is correct
The correct answer is \(24\) cm\(^2\) Area of a square \(=\) side \(×\) side \(=36→\) side \(=6\) Perimeter of a square \(= 4 \ ×\) side \(= 4 \ × \ 6=24\)

13 Choice D is correct
The correct answer is \(40\) The length of the rectangle is \(15\). Then, its width is \(5\). \(15 \ ÷ \ 3 = 5\) Perimeter of a rectangle \(=2 \ ×\) width \(+ \ 2 \ ×\) length \(=2 \ × \ 5 \ + \ 2 \ × \ 15=\) \(10 \ + \ 30=40\)

14 Choice E is correct
The correct answer is \(3\) Dividing \(123\) by \(5\) leaves a remainder of \(3\).

15 Choice E is correct
The correct answer is \(19\) \(7 \ + \ 3=10\) \(10 \ + \ 4=14\) \(14 \ + \ 5=19\) \(19 \ + \ 6=25\)

16 Choice C is correct
The correct answer is \(2,000\) \(7,200 \ + \ A \  \ 300=8,900→\) \(72,00 \ + \ A=8,900 \ + \ 300=9,200→\) \(A=9,200 \  \ 7,200=2,000\)

17 Choice A is correct
The correct answer is \(1\) \(x \ + \ 5=7→x=2\) \(2 \ y=6→y=3\) \(y \  \ x=3 \  \ 2=1\)

18 Choice D is correct
The correct answer is \($400\) \($80\) off is the same as \(20\) percent off. Thus, \(20\) percent of a number is \(80\). Then: \(20\%\) of \(x=80→\) \(0.20 \ x=80→\) \(x=\frac{80}{0.20}=400\)

19 Choice D is correct
The correct answer is \($11.00\) \(25\) percent of \($44.00\) is \($11\). (Remember that \(25\) percent is equal to one fourth)

20 Choice A is correct
The correct answer is \(0.5\) \(\frac{5}{3}=1.6 \ > \ 0.5\)

21 Choice E is correct
The correct answer is \(123\) \(256 \  \ x \ + \ 108=241→\) \(256 \  \ x=241 \  \ 108=133→\) \(x=256 \  \ 133=123\)

22 Choice C is correct
The correct answer is \(1020\) \(400 \ + \ \Box \  \ 120=1,300→\) \(400 \ + \ \Box = 1,300 \ +\ 120=1,420\) \(\Box = 1,420 \ – \ 400 = 1020\)

23 Choice B is correct
The correct answer is \(3\) \(N \ × \ (8 \  \ 3)=15→\) \(N \ × \ 5=15→N=3\)

24 Choice E is correct
The correct answer is \(4.84\) \(9.04 \  \ 4.2=4.84\)

25 Choice B is correct
The correct answer is \(24\) \(\frac{2}{5}\) of students are girls. Therefore, \(\frac{3}{5}\) of students in the class are boys. \(\frac{3}{5}\) of \(40\) is \(24\). There are \(24\) boys in the class. \(\frac{3}{5} \ × \ 40=\frac{120}{5}=24\)

26 Choice C is correct
The correct answer is \(0.7596\) Of the numbers provided, \(0.7596\) is the greatest.

27 Choice D is correct
The correct answer is \(8\) The closest number to \(8.05\) is \(8\).

28 Choice A is correct
The correct answer is \(26\) If \(x∎y=5 \ x \ + \ y \  \ 4\), Then: \(4∎10=5 \ (4) \ + \ 10 \  \ 4=20 \ + \ 10 \  \ 4=26\)

29 Choice C is correct
The correct answer is \((2 \times \ 3 \ + \ 4) \ \times \ 2=18\) Choice C is not correct. \((2 \times \ 3 \ + \ 4) \ \times \ 2=20\) not \(18\)

30 Choice C is correct
The correct answer is \(0.5\) \(\frac{4}{3} \  \ \frac{5}{6}=\frac{8}{6} \  \ \frac{5}{6}=\frac{3}{6}=\frac{1}{2} =0.5\)
