You have no choices listed but here's the answer: (85 + 91 + x) / 3 = 94 Multiplying both sides by 3 85 + 91 + x = 282 x = 106 In order for her to get a 94 average she would need a mark of 106 on her next test.
45% of 40 is 0.45×40=18 girls if x girls join then 56% of 40+x is 0.56(40+x)=18+x 22.4+0.56x=18+x put together like terms 4.4=0.44x <span>x=10 girls joined</span>
