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Total children = 30

Each child has books = 3

Total books = 30 x 3 = 90

Each child has books = 3

Total books = 30 x 3 = 90

Total books they both bought = 5

One sister bought books = 2

Let second bought books = x

According to statement,

x + 2 = 5

=> x = 5 - 2

=> x = 3

Hence second sister bought 3 books.

One sister bought books = 2

Let second bought books = x

According to statement,

x + 2 = 5

=> x = 5 - 2

=> x = 3

Hence second sister bought 3 books.

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Let First Number = x

then Second Number = x + 1

According to statement,

=> x + x + 1 = 31

=> 2x + 1 = 31

=> 2x = 30

=> x = $\frac{30}{2}$

=> x = 15

=> First Number = 15

Second Number = x + 1 = 15 + 1 = 16

**Hence two consecutive numbers are 15, 16.**

then Second Number = x + 1

According to statement,

=> x + x + 1 = 31

=> 2x + 1 = 31

=> 2x = 30

=> x = $\frac{30}{2}$

=> x = 15

=> First Number = 15

Second Number = x + 1 = 15 + 1 = 16

Let smaller angle = x

then larger angle = x + 16

**Since angles are complimentary, their sum is 90 degree.**

According to statement,

x + (x + 16) = 90

=> 2x + 16 = 90

=> 2x = 90 - 16

=> 2x = 74

=> x = $\frac{74}{2}$

=> x = 37

=> Smaller angle = 37

Larger angle = x + 16 = 37 + 16 = 53.

then larger angle = x + 16

According to statement,

x + (x + 16) = 90

=> 2x + 16 = 90

=> 2x = 90 - 16

=> 2x = 74

=> x = $\frac{74}{2}$

=> x = 37

=> Smaller angle = 37

Larger angle = x + 16 = 37 + 16 = 53.

Let smaller number = x

Then larger number = x + 4

According to statement,

=> x + (x + 4) = -6

=> 2x + 4 = -6

=> 2x = -6 - 4

=> 2x = -10

=> x = $\frac{-10}{2}$

=> x = -5

=> Smaller Number = -5

Larger Number = x + 4 = -5 + 4 = -1

Then larger number = x + 4

According to statement,

=> x + (x + 4) = -6

=> 2x + 4 = -6

=> 2x = -6 - 4

=> 2x = -10

=> x = $\frac{-10}{2}$

=> x = -5

=> Smaller Number = -5

Larger Number = x + 4 = -5 + 4 = -1