4 ms·
A bat and ball cost a dollar and ten cents. The bat costs a dollar more than the ball bat + ball = 1.1 bat = ball + 1 2bat + ball = ball +1.1 +1 2bat =
by vain 14y ago
A bat and ball cost a dollar and ten cents. The bat costs a dollar more than the ball
bat + ball = 1.1
bat = ball + 1
2bat + ball = ball +1.1 +1
2bat = 2.1
bat = 1.05
ball =0.05
- debacle 14y agoI parsed that as: bat = 1.1 ball = 1.1 bat = ball + 1 It confused the hell out of me.
- saraid216 14y agoI immediately switched to generic variables X and Y, rather than keeping the original names. It helps.
- farinasa 14y agobat - ball = 1 1 - .1 = .9 1.05 - .05 = 1
- roguecoder 14y agoMy thought process went, "a dollar is 90 cents more than 10 cents, so $1.05 is a dollar more than five cents". I made exactly the same fallacy as those in this study; I've just learned to check my work. On the other hand, I suspect the whole process of estimation and refinement was faster than writing out those equations.
- lupatus 14y agoIt is a system of equations: 1) bat + ball = 1.10 2) bat = ball + 1 via substitution... 1) ball + 1 + ball = 1.10 1) 2ball = 0.10 1) ball = 0.05 again via substitution... 2) bat = 0.05 + 1 2) bat = 1.05 easy peazy