
Plug in A = 13

Add 1 to both sides:

Divide 2 to both sides:

Find the cube root of both sides:
![\sf~b=\sqrt[3]{7}](https://tex.z-dn.net/?f=%5Csf~b%3D%5Csqrt%5B3%5D%7B7%7D)
Percent means parts out of 100
140%=140/100=1.4
'of' means multiply
'is' means =
140% of what is 48 means
1.4 times what=48
divide both sides by 1.4
what=34.285714285714285714285714...
Maybe 50 because if 5+5 pages is 40 minutes you would add another page which would be maybe 50 minutes