Maths Week Day 3

Tuesday’s Solution

 

Lets take the number as x, when he multiplied it with 2 he got (2x); from which he subtracted 138 i.e. 2x – 138 and the answer is 102

<=> 2. x -138 = 102 We must solve this equation to find the thought number
2*x – 138 = 102 <=> 2x = 240 <=> x = 240/2

x = 120

 

Wednesday’s Puzzle

 

•One of the sides of a rectangle is 3cm shorter than the other one. Find the sides of the rectangle if we increase every side by 1cm, the surface area of the rectangle will be increased by 18cm2