Prakash Tiwari and Ishita Joshi Solutions for Chapter: Integers, Exercise 4: Brain Teasers

Simplify:

$1.\left(a\right): \left(-10\right)÷2\times$_____$-\left[\left(-4\right)+16-\overline{12-3\text{ of} 9}\right]=-112$

Simplify:

$1.\left(b\right): 63÷9\times 4+$_____$\left\{44+13\times \left(-4\right)-5-11+6\right\}=10$

Monday's temperature was $6^{\circ }$C warmer than Sunday's. Tuesday's was ${10}^{\circ }$C cooler than Sunday's. If Monday's temperature was ${34}^{\circ }$C, what was the temperature on Tuesday$?$

A submarine descends at the rate of $2$ m per minute. If it starts its descent from $30$ m below the sea level, then how long will it take to reach $210$ m below the sea level$?$

John is playing a game with a regular dice. If the number that turns up is a prime number, he will loose $5$ times that number. If t is not a prime number, he gains $10$ times the number that comes up. In two rolls, if he turns up with $5$ and $1,$ then what is his final score$?$