9
Q:

# The sum of all two digit numbers divisible by 5 is

 A) 945 B) 678 C) 439 D) 568

Answer:   A) 945

Explanation:

Required numbers are 10,15,20,25,...,95
This is an A.P. in which a=10,d=5 and l=95.
Let the number of terms in it be n.Then t=95
So a+(n-1)d=95.
10+(n-1)*5=95,then n=18.
Required sum=n/2(a+l)=18/2(10+95)=945.

Q:

Find the next number in the series 125, 80, 45, 20, ....

 A) 5 B) 15 C) -5 D) 10

Answer & Explanation Answer: A) 5

Explanation:

The pattern is -45, -35, -25, -15

The next number = 20-15= 5

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7 45
Q:

Find the next number in the series 141,137,146,130,155,119,...

 A) 147 B) 168 C) 162 D) 182

Answer & Explanation Answer: B) 168

Explanation:

The pattern is -4, +9,-16, +25, -36

The next number=119+49=168

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4 14
Q:

Find the next number in the series 3, 4, 5, 5, 12, 13, 7, 24, 25, 8, 15, ...

 A) 26 B) 16 C) 17 D) 18

Answer & Explanation Answer: C) 17

Explanation:

The pattern is $3^{2}+4^{2}=5^{2}$,  $5^{2}+12^{2}=13^{2}$$7^{2}+24^{2}=25^{2}$

The next number = $8^{2}+15^{2}=17^{2}$

i.e. 17

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9 143
Q:

Find the next number in the series 14, 916, 2536,......

 A) 4981 B) 6481 C) 4964 D) 6449

Answer & Explanation Answer: C) 4964

Explanation:

The pattern is $1^{2}$$2^{2}$$3^{^{2}}$$4^{2}$$5^{2}$$6^{2}$

The next number= $7^{2}^{}$$8^{2}$ = 4964

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10 163
Q:

Find the next number in the series 2, 3, 4, 8, 9, 10, 11, 16, 17, 18, 19, 20,...

 A) 27 B) 26 C) 24 D) 25

Answer & Explanation Answer: B) 26

Explanation:

The pattern is three consecutive numbers and then three consecutive numbers missing.Then four consecutive numbers and then four consecutive numbers missing.Then five consecutive numbers and then five consecutive numbers missing.

The next number=20+6=26

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7 115