- 45% of 840 – 65% of 420 – 2 * ? = 43
28313522NoneOption B

Solution:

45% of 840 – 65% of 420 – 2 * x = 43

378-273-2x=43

105-2x=43

2x=105-43

2x=62

x=31.

- [6/4 × 32/8 × 6/16] + [6/16 × 24/8 × 36/4] = ?
83/894/599/899/5NoneOption C

Solution:

[6/4 × 32/8 × 6/16] + [6/16 × 24/8 × 36/4] = x

9/4+81/8=x

x=(18+81)/8

x=99/8.

- 522/29*10 + 126 = ? + 250
55585666NoneOption C

Solution:

522/29*10+126= x + 250

180+126-250=x

x=56.

- 3521 + 320.6 + 1215.35 – 4522.62 + 1455.3 = ?
1877.451926.301845.331989.63NoneOption D

Solution:

3521+320.6+1215.35-4522.62+1455.3=x

6512.25-4522.62=x

x=1989.63.

- 3/9 of 2520 + 75% of 550 = ?
^{2}– 3836342644NoneOption A

Solution:

3/9 of 2520 + 75% of 550 = x^{2}– 38

840+418+38=x^{2}

1296=x^{2}

x=36.

- [2√392 – 21] + (√8-7)
^{2}= ?^{2}86911NoneOption B

Solution:

[2√392 – 21] + (√8-7)^{2}= x^{2}

[2 √49*8 -21] + 8+ 49 -14√8= x^{2}

14√8 -21 +57 -14√8= x^{2}

x^{2}=36

x=6.

- (2 5/3 + 4 1/6 + 5 5/6 ) + ? = 13
2/31/32/53/5NoneOption A

Solution:

(2 5/3 + 4 1/6+ 5 5/6 )+ x = 13

11/3+25/6+35/6 +x=13

x=(22+25+35-78)/6

=4/6=2/3.

- (8
^{2}* 5^{2})/200√2 = ?6√28√28/√26/√2NoneOption C

Solution:

(8^{2}* 5^{2}) / 200√2 = x

=(64*25) / 200√2

x=8/√2.

- 17
^{2}– 21^{2}+ 13^{2}= ?17223428NoneOption A

Solution:

17^{2}-21^{2}+13^{2}=x

289 – 441 + 169=x

x=17.

- 1.6
^{2}/0.8^{2}= [2.4^{2}/0.4^{2}] – ?28323624NoneOption B

Solution:

1.6^{2}/0.8^{2}= [2.4^{2}/0.4^{2}] – x

(1.6*1.6)/(0.8*0.8) = (2.4*2.4)/(0.4*0.4)-x

4 = 36– x

x=32.

THANK U MAM

10 ans 32

Yes

thnx

3 ans is 56

Yes we will change it.

q.10 plz explain