Practice30 Create account

For any two numbers a and $b$ , let a @ $b$ mean $a \times a - b$ , and let a # $b$ mean $a + 2 b$ . What is the value of (5 @ 3) # 4?

Competition practiceReasoning & Mental Ability

A26
B34
C30
D28

Step-by-Step Solution

First work out the bracket: 5 @

3 = 5 \times 5 - 3 = 25 - 3 = 22

. Now apply the second rule: 22 #

4 = 22 + 2 \times 4 = 22 + 8 = 30

.

Answer: C) 30

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Reasoning & Mental Ability practice questions

More Reasoning & Mental Ability practice

If '÷' means '+', '+' means '−', '×' means '÷' and '−' means '×', then what is the value…A natural number leaves a remainder of 3 when divided by 5, and a remainder of 4 when…Five books P, Q, R, S and T are placed one above the other in a single stack. R is…A wooden cube is painted red on all six faces and is then cut into 27 identical smaller…A dice is made so that the numbers on opposite faces always add up to 7. It rests on a…