Arithmetic Questions Answers

People are sitting in that row = (16+10-1) = 26-1 = 25

$begin{aligned} 63.99 times frac{15}{8} + 353 &= 10444 div x \ Rightarrow 64 times frac{15}{8} + 353 &= 10444 div x \ Rightarrow 120+353 &= 10444 div x \ Rightarrow 473 &= 10444 div x \ Rightarrow x &= frac{10444}{473} \ &approx 22$

$sqrt{624} times 14.02 + sqrt{404} times 15.97$

$begin{aligned} &approx 25 times 14 + 20 times 16 &approx 350 + 320 &approx 670 end{aligned}$

$8461 div 11.99 - 24.01 div frac{5}{10}$

$approx 705 - 24 times 20$

$approx 705 - 480$

$approx 225$

14.85% of 679 + 19.9% of 219.89

$approx frac{15}{100} times 679 + frac{20}{100} times 220$

$approx 101 + 44$

$approx 145$

$begin{aligned} because quad & 23+5-2 = 26 & 13+8-2 = 19 therefore quad & 39+7-2 = 44 end{aligned}$

Let the number be $x$
Then, according to the question,

$begin{aligned} x + x^2 = 240 Rightarrow quad quad x^2+x-240=0 x^2-16x-15x-240=0 x(x+16) - 15(x+16) = 0 (x-15)(x+16) = 0 x = 15, text{ and } =-16 end{aligned}$

So, the number be =15