Let
x--------> the number of blue beads
y--------> the number of red beads
we know that

-------> equation 
------> equation 
equate equation
and equation 

find the value of x

therefore
the answer is
Ivan has

2nd one because it’s not a lot of big number I hope it helps
First simplify the square roots:

Then simplify the last two terms:

Since 61 is prime, you can't take a rational root out of it.
Same would need to get at least a 95% on the next test, if he would like to receive a total average of an 80%