What is the value of x?

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5/ 40 = 3 /(2x + 10)
5(2x+10) = 3 * 40
10x + 50 = 120
10x = 70
    x = 7

answer
x = 7

The only number less than 8 that can equal 12 would be 6, 36 is the dividend

One shot. if 60% of 10 is 6, then what is 70%? we know it would be seven (since 60% is mathematically 60/100, or 6/10, then 70% is 70/100, or 7/10) but we can check anyway using ratios: 6 : 60% = x : 70%*inverse multiplicationx * 60% = 6 * 70%*divide both sides by 60%x = (6 * 70%) / 60%x = 7and since he has made 6 shots already, he would need just one more to get 7 shots or 70%. if the explanation is too confusing, comment and i will try to