10% of £80 = 20% of £ is an equation.
.1*80 = .2*x
.1*80/.2 = x
8/.2 = x
40 = x
Your boy did good. Teacher is wrong.
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10% of £80 = 20% of £ is an equation.
.1*80 = .2*x
.1*80/.2 = x
8/.2 = x
40 = x
Your boy did good
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