Which of the following interchange of numbers and mathematical signs would make the given equation correct?
 30 ÷ 6 × 4 + 15−35 = 25

Which of the following interchanges in signs and numbers will make the given equation correct?

8 x 6 + 4 = 52

A tree increases annually by 1/8th of its height. By how much will it increase after 2 years, if it stands today 64cm high?

Direction: Some equations have been solved on the basis of certain system. Find the correct answer for the unsolved equation on that basis.

If 1 + 4 = 9, 2 + 8 = 18, 3 + 6 = 15 then 7 + 8 =?

If A denotes ‘+’, B denotes ‘×’, C denotes ‘−’ and D denotes ‘÷’, then what will come in place of ‘?’ in the following equation?
 (13 B 9) D 3 A (14 D 7) B 6 C 21 A (32 B 2) = ? 

If A denotes ‘+’, B d enotes ‘×’, C denotes ‘−’ and D denotes ‘÷’, then what will come in place of ‘?’ in the following equation?
 41 C 29 A (38 B 3) D 19 A 61 C 17 = ?

After interchanging the two numbers 3 and 6, what will be the value of the given expression?

12 × 3 ÷ 6 + 8 – 2

Direction: Some equations have been solved on the basis of certain system. Find the correct answer for the unsolved equation on that basis.

If 98 – 39 – 27 = 31, 87 – 38 – 34 = 20, then 79 – 25 – 12 = ?