Let Xiao Fang jump x every minute, that is, Xiaohong is [x+ 12].

According to the meaning of the question, 2 * (x+12)+3 * (x+12)+3x = 780.

2x+24+3x+36+3x=780

8x=720

x = 90°

X equals 90, so the little red jump is 90+ 12= 102.

example

A=5 equation

2+3=5 equation

2+3=a+b=6+c equation, expression

2+5≠ 10 inequality